So I am making a responsive audio waveform, if you don't know what that is, it is something like this: (btw this is my goal to make those audio waveforms).
https://i.ytimg.com/vi/J7uN-SQtOYI/maxresdefault.jpg
https://www.youtube.com/watch?v=OVMuwa-HRCQ
https://www.youtube.com/watch?v=SCD2tB1qILc
I don't know how to describe it, so just look at the videos and image.

but my question is, how do I get the values from the "AudioSpectrumListener", it has a lambda expression.
And I need the value of the magnitude. So I can print out the values.
Later I will use the values to make rectangles and that rectangles will change height shape because of the changing value from the magnitude.

I looked at some examples and tutorials, here are some:
jnlps://download.oracle.com/otndocs/products/javafx/8/samples/Ensemble/Ensemble.jnlp
https://victor-fx.blogspot.com/2017/08/audio-visualization-in-javafx.html

as you can see, I used animation timer, because the "AudioSpectrumInterval" is on 60, that means it updates 60 times in a second.
I can use a for a loop too, but it will print out the same values about a couple of times, or even more than that.

Recommended Answers

The last link you posted explains how to get and understand the magnitudes, so what exactly is your question?

Jump to Post

You can’t print those values in the start method. Start runs once and is finished before the music starts playing.
You can only access the values via the spectrum listener when the listener is called.

ps: you may want to have the listener called more that once per minute ;)

Jump to Post

how do I see when listener is called

OK, you seem to be missing some basic understanding here. It's just like using a listener for someone pressing a button.

You have set this as a audio spectrum listener. Which means:

  • this contains a spectrumDataUpdate listener method …
Jump to Post

Looks like some very quiet music. (those numbers are deciBels)
While testing it will be more manageable if you have (say) 8 bands rather than 256.

I thought if I set the interval to 60, I thought it would update 60 times per second

I guessed that …

Jump to Post

if I placed the class just in v7, the error is gone and the music can play, but if the class is inside of v7.v1 then I get that error.

Then just place the class in v7! Faffing around with IDEs just a distraction from learning a language …

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I just need the magnitudes to be accesable from the whole class.
(btw, I am going to remove animationtimer

The last link you posted explains how to get and understand the magnitudes, so what exactly is your question?

I just want to System.out.println(magnitudes[i]);
in the start method, but how do I even do that?
I tried this:

import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.media.AudioSpectrumListener;
import javafx.scene.media.Media;
import javafx.scene.media.MediaPlayer;
import javafx.scene.paint.Color;
import javafx.stage.Stage;

public class AWF_Main extends Application implements AudioSpectrumListener {

    public final static String TITLE = "AWF special program";
    public final static short WIDTH = 1280;
    public final static short HEIGHT = 720;
    public static String AUDIO_FILE = "../mp3Music/Cynematic - Waterbased.mp3";
    public static String AUDIO_URI = AWF_Main.class.getResource(AUDIO_FILE).toExternalForm();

    private Stage window;
    private Scene mainS;
    private Group groupS;
    private AudioSpectrumListener asl;
    private static MediaPlayer audioMP;
    private float[] correctedMagnitude;

    @Override
    public void spectrumDataUpdate(double timestamp, double duration, float[] magnitudes, float[] phases) {
        for(int i = 0; i < magnitudes.length; i++) {
            correctedMagnitude[i] = magnitudes[i] - audioMP.getAudioSpectrumThreshold();
            //System.out.println(correctedMagnitude[i]);
        }
    }

    @Override
    public void start(Stage primaryStage) throws Exception {
        groupS = new Group();
        mainS = new Scene(groupS, WIDTH, HEIGHT, Color.DEEPPINK);
        window = primaryStage;
        window.setScene(mainS);
        window.setTitle(TITLE);
        window.show();

        // setup media
        Media audioMedia = new Media(AUDIO_URI);
        audioMP = new MediaPlayer(audioMedia);
        audioMP.setAudioSpectrumListener(this);
        play();

        //correctedMagnitude[5], why 5, because I chosed a random number.
        System.out.println(correctedMagnitude[5]);
    }

    //audioMP.setVolume(0.02); is low, because I just like to listen in low volume while I listen to other music. (:
    public void play() {
        audioMP.play();
        audioMP.setVolume(0.02);
        audioMP.setAudioSpectrumInterval(60.0);
        audioMP.setAudioSpectrumNumBands(256);
    }

    public void stop() {
        System.out.println("program exited");
    }

    public static void main(String[] args) {
        launch(args);
    }
}

I don't want to use charts.

here is my Error:

Exception in Application start method
program exited
java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:389)
    at com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:328)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at sun.launcher.LauncherHelper$FXHelper.main(Unknown Source)
Caused by: java.lang.RuntimeException: Exception in Application start method
    at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:917)
    at com.sun.javafx.application.LauncherImpl.lambda$launchApplication$1(LauncherImpl.java:182)
    at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NullPointerException
    at com.VINSTORM.bleidorb.AudioWaveFormFX_V1.v1.AWF_Main.start(AWF_Main.java:52)
    at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$8(LauncherImpl.java:863)
    at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$7(PlatformImpl.java:326)
    at com.sun.javafx.application.PlatformImpl.lambda$null$5(PlatformImpl.java:295)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.sun.javafx.application.PlatformImpl.lambda$runLater$6(PlatformImpl.java:294)
    at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at com.sun.glass.ui.win.WinApplication.lambda$null$3(WinApplication.java:177)
    ... 1 more
Exception running application com.VINSTORM.bleidorb.AudioWaveFormFX_V1.v1.AWF_Main

btw, this is a link too:
jnlps://download.oracle.com/otndocs/products/javafx/8/samples/Ensemble/Ensemble.jnlp
there is a audiobarchart.

at com.VINSTORM.bleidorb.AudioWaveFormFX_V1.v1.AWF_Main.start(AWF_Main.java:52) = System.out.println(correctedMagnitude[5]);

You can’t print those values in the start method. Start runs once and is finished before the music starts playing.
You can only access the values via the spectrum listener when the listener is called.

ps: you may want to have the listener called more that once per minute ;)

commented: The old PRINT A; A=1: issue. Why did A print? +15
commented: how do I see when listener is called +0

how do I see when listener is called

OK, you seem to be missing some basic understanding here. It's just like using a listener for someone pressing a button.

You have set this as a audio spectrum listener. Which means:

  • this contains a spectrumDataUpdate listener method
  • when the media is playing JavaFX will reguarly call your spectrumDataUpdate method at the interval you have requested (60 seconds!) passing it the audio spectrum data for the latest interval.
  • In your spectrumDataUpdate method you do whatever you want with that data, eg correct the magnitudes and pass it to another method that displays it

PS: You may want to set a lower interval. The default is 0.1 seconds.

pps: It's best if you reply with a new post rather than a comment because new comments don't get prioretised in the "latest posts" listing that I'm monitoring.

yes! Now I can finally use the values :D

this is my code:

import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.media.AudioSpectrumListener;
import javafx.scene.media.Media;
import javafx.scene.media.MediaPlayer;
import javafx.scene.paint.Color;
import javafx.stage.Stage;

public class AWF_Main extends Application implements AudioSpectrumListener {

    public final static String TITLE = "AWF special program";
    public final static short WIDTH = 1280;
    public final static short HEIGHT = 720;
    public static String AUDIO_FILE = "../mp3Music/Cynematic - Waterbased.mp3";
    public static String AUDIO_URI = AWF_Main.class.getResource(AUDIO_FILE).toExternalForm();

    private Stage window;
    private Scene mainS;
    private Group groupS;
    private static MediaPlayer audioMP;

    @Override
    public void spectrumDataUpdate(double timestamp, double duration, float[] magnitudes, float[] phases) {
        System.out.println("data updated");
        displayMag(magnitudes);
        for(int i = 0; i < magnitudes.length; i++) {
            //correctedMagnitude[i] = magnitudes[i] - audioMP.getAudioSpectrumThreshold();
//            System.out.println("0"+magnitudes[0]);
//            System.out.println("1"+magnitudes[1]);
//            System.out.println("2"+magnitudes[2]);
//            System.out.println("3"+magnitudes[3]);
//            System.out.println("4"+magnitudes[4]);
//            System.out.println("5"+magnitudes[5]);
//            System.out.println("6"+magnitudes[6]);
//            System.out.println("7"+magnitudes[7]);
//            System.out.println("8"+magnitudes[8]);
//            System.out.println("9"+magnitudes[9]);
            //System.out.println(correctedMagnitude[i]);
        }
    }

    public void displayMag(float[] mag) {
        for(int i = 0; i < mag.length; i++) {
            System.out.println(i+": " + mag[i]);
        }
        System.out.println("length of mag = " + mag.length);
    }

    public void init() {
        Media audioMedia = new Media(AUDIO_URI);
        audioMP = new MediaPlayer(audioMedia);
        play();
    }

    @Override
    public void start(Stage primaryStage) throws Exception {
        groupS = new Group();
        mainS = new Scene(groupS, WIDTH/2, HEIGHT/2, Color.DEEPPINK);
        window = primaryStage;
        window.setScene(mainS);
        window.setTitle(TITLE);
        window.show();
    }

    //audioMP.setVolume(0.02); is low, because I just like to listen in low volume while I listen to other music. (:
    public void play() {
        audioMP.play();
        audioMP.setVolume(0.02);
        audioMP.setAudioSpectrumInterval(0.5);
        audioMP.setAudioSpectrumNumBands(256);
        audioMP.setAudioSpectrumListener(this);
        //AWF_newClass.printOutMagnitudes();
    }

    public void stop() {
        System.out.println("program exited");
    }

    public static void main(String[] args) {
        launch(args);
    }
}

I thought if I set the interval to 60, I thought it would update 60 times per second and I didn't noticed it

this is what the console says:

data updated
0: -59.407444
1: -48.37642
2: -41.535774
3: -40.149982
4: -44.27457
5: -44.982887
6: -48.725376
7: -52.21941
8: -54.77891
9: -50.22617
10: -53.42569
11: -55.172703
12: -55.079517
13: -53.60956
14: -53.745964
15: -57.46172
16: -57.445312
17: -57.044395
18: -52.888622
19: -54.909782
20: -57.15198
21: -56.71712
22: -56.429665
23: -57.09065
24: -57.157146
25: -57.19809
26: -57.740284
27: -56.86342
28: -56.226715
29: -57.350414
30: -57.268696
31: -57.377327
32: -57.740887
33: -56.40759
34: -55.88547
35: -56.44446
36: -57.326187
37: -57.204216
38: -55.604618
39: -55.611687
40: -56.671505
41: -55.99083
42: -54.81242
43: -54.81779
44: -55.155308
45: -54.862213
46: -56.785095
47: -57.21616
48: -56.16005
49: -56.611744
50: -57.336994
51: -56.80366
52: -56.719086
53: -56.731297
54: -57.696148
55: -56.97476
56: -57.19966
57: -56.635822
58: -56.079693
59: -56.365444
60: -56.58281
61: -57.3104
62: -57.90639
63: -57.26793
64: -57.42998
65: -58.106003
66: -56.51674
67: -55.527695
68: -55.31978
69: -56.59834
70: -57.75076
71: -57.570744
72: -55.88267
73: -55.103874
74: -56.05077
75: -56.008892
76: -55.499
77: -56.47118
78: -56.83968
79: -57.00147
80: -56.647213
81: -56.488712
82: -55.836987
83: -56.97192
84: -57.72063
85: -58.830986
86: -58.433346
87: -57.937386
88: -58.045086
89: -57.081215
90: -56.94066
91: -57.460472
92: -57.537506
93: -57.83281
94: -58.671604
95: -58.726414
96: -58.39954
97: -57.964382
98: -59.422413
99: -58.608257
100: -56.711
101: -57.214962
102: -58.341293
103: -58.0045
104: -58.1659
105: -57.890232
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125: -58.028236
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139: -58.636475
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142: -59.586685
143: -59.380665
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160: -59.701836
161: -59.716305
162: -59.90483
163: -59.90511
164: -59.8642
165: -59.64051
166: -59.573845
167: -59.894054
168: -59.98699
169: -60.0
170: -60.0
171: -59.934967
172: -59.94722
173: -59.94488
174: -59.983204
175: -60.0
176: -59.960846
177: -59.94087
178: -59.92735
179: -59.97077
180: -60.0
181: -60.0
182: -60.0
183: -60.0
184: -60.0
185: -60.0
186: -60.0
187: -60.0
188: -60.0
189: -60.0
190: -60.0
191: -60.0
192: -60.0
193: -60.0
194: -60.0
195: -60.0
196: -60.0
197: -60.0
198: -60.0
199: -60.0
200: -60.0
201: -60.0
202: -60.0
203: -60.0
204: -60.0
205: -60.0
206: -60.0
207: -60.0
208: -60.0
209: -60.0
210: -60.0
211: -60.0
212: -60.0
213: -60.0
214: -60.0
215: -60.0
216: -60.0
217: -60.0
218: -60.0
219: -60.0
220: -60.0
221: -60.0
222: -60.0
223: -60.0
224: -60.0
225: -60.0
226: -60.0
227: -60.0
228: -60.0
229: -60.0
230: -60.0
231: -60.0
232: -60.0
233: -60.0
234: -60.0
235: -60.0
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237: -60.0
238: -60.0
239: -60.0
240: -60.0
241: -60.0
242: -60.0
243: -60.0
244: -60.0
245: -60.0
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247: -60.0
248: -60.0
249: -60.0
250: -60.0
251: -60.0
252: -60.0
253: -60.0
254: -60.0
255: -60.0
length of mag = 256
data updated
0: -58.938725
1: -46.33748
2: -37.530647
3: -32.70217
4: -37.956696
5: -44.20575
6: -49.34532
7: -52.65845
8: -52.185795
9: -48.955708
10: -51.62807
11: -51.65423
12: -51.50781
13: -50.99753
14: -51.735165
15: -54.147144
16: -54.45941
17: -56.08918
18: -50.666042
19: -53.640854
20: -55.419495
21: -55.679142
22: -56.14381
23: -54.916134
24: -56.279785
25: -57.086823
26: -56.44943
27: -54.020206
28: -54.95245
29: -55.113552
30: -56.056557
31: -57.09868
32: -55.27939
33: -55.496223
34: -56.25147
35: -55.48283
36: -56.310047
37: -55.447582
38: -55.365105
39: -56.196175
40: -56.29256
41: -55.27897
42: -54.00971
43: -53.098827
44: -53.29164
45: -53.64179
46: -54.644833
47: -56.801025
48: -55.36362
49: -55.531693
50: -55.63488
51: -55.87493
52: -55.85561
53: -54.896614
54: -56.388023
55: -56.39946
56: -56.81492
57: -55.081413
58: -53.777622
59: -54.964718
60: -54.655857
61: -56.511967
62: -56.169037
63: -55.857506
64: -56.742092
65: -56.160236
66: -54.84903
67: -54.93572
68: -55.52359
69: -57.60032
70: -56.259018
71: -56.619724
72: -55.2432
73: -53.982727
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170: -59.861958
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174: -59.819096
175: -59.84975
176: -59.79475
177: -59.866272
178: -59.735023
179: -59.829197
180: -59.94671
181: -59.9729
182: -59.97025
183: -59.983433
184: -60.0
185: -60.0
186: -59.953056
187: -60.0
188: -59.990234
189: -60.0
190: -59.91111
191: -60.0
192: -60.0
193: -60.0
194: -60.0
195: -60.0
196: -60.0
197: -60.0
198: -60.0
199: -60.0
200: -60.0
201: -60.0
202: -60.0
203: -60.0
204: -60.0
205: -60.0
206: -60.0
207: -60.0
208: -60.0
209: -60.0
210: -60.0
211: -60.0
212: -60.0
213: -60.0
214: -60.0
215: -60.0
216: -60.0
217: -60.0
218: -60.0
219: -60.0
220: -60.0
221: -60.0
222: -60.0
223: -60.0
224: -60.0
225: -60.0
226: -60.0
227: -60.0
228: -60.0
229: -60.0
230: -60.0
231: -60.0
232: -60.0
233: -60.0
234: -60.0
235: -60.0
236: -60.0
237: -60.0
238: -60.0
239: -60.0
240: -60.0
241: -60.0
242: -60.0
243: -60.0
244: -60.0
245: -60.0
246: -60.0
247: -60.0
248: -60.0
249: -60.0
250: -60.0
251: -60.0
252: -60.0
253: -60.0
254: -60.0
255: -60.0
length of mag = 256
data updated
0: -59.207775
1: -49.29684
2: -39.506638
3: -35.27126
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length of mag = 256
program exited

Looks like some very quiet music. (those numbers are deciBels)
While testing it will be more manageable if you have (say) 8 bands rather than 256.

I thought if I set the interval to 60, I thought it would update 60 times per second

I guessed that was the case. It's a really good example of why you should ALWAYS read the API doc for any method you're not familiar with.

I got a error from this: "public static String AUDIO_URI = AWF_Core.class.getResource(AUDIO_FILE).toExternalForm();"
I made a new class, so the code looks more cleaner and readable.
but unfortunatly I don't know what happened?

I got a error:

Exception in thread "JavaFX Application Thread" Exception in thread "main" java.lang.ExceptionInInitializerError
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Unknown Source)
    at com.sun.javafx.application.LauncherImpl.lambda$launchApplicationWithArgs$2(LauncherImpl.java:352)
    at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$7(PlatformImpl.java:326)
    at com.sun.javafx.application.PlatformImpl.lambda$null$5(PlatformImpl.java:295)
    at java.security.AccessController.doPrivileged(Native Method)
    at com.sun.javafx.application.PlatformImpl.lambda$runLater$6(PlatformImpl.java:294)
    at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
    at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
    at com.sun.glass.ui.win.WinApplication.lambda$null$3(WinApplication.java:177)
    at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NullPointerException
    at com.VINSTORM.bleidorb.AudioWaveFormFX_V1.v7.v1.AWF_Core.<clinit>(AWF_Core.java:18)
    ... 11 more
java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at sun.launcher.LauncherHelper$FXHelper.main(Unknown Source)
Caused by: java.lang.NullPointerException
    at com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:383)
    at com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:328)
    ... 5 more

this is how my project folders looks like in the navigator.

filesandprojectsIguess.PNG

here is my new code:

package com.VINSTORM.bleidorb.AudioWaveFormFX_V1.v7.v1;

import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.media.AudioSpectrumListener;
import javafx.scene.media.Media;
import javafx.scene.media.MediaPlayer;
import javafx.scene.paint.Color;
import javafx.stage.Stage;

public class AWF_Core extends Application implements AudioSpectrumListener {

    public final static String TITLE = "AWF special program";
    public final static short WIDTH = 1280;
    public final static short HEIGHT = 720;
    public static String AUDIO_FILE = "../mp3Music/Cynematic - Waterbased.mp3";
    public static String AUDIO_URI = AWF_Core.class.getResource(AUDIO_FILE).toExternalForm();

    private Stage window;
    private Scene mainS;
    private Group groupS;
    private static MediaPlayer audioMP;

    @Override
    public void spectrumDataUpdate(double timestamp, double duration, float[] magnitudes, float[] phases) {
        System.out.println("data updated");
        displayMag(magnitudes);
    }

    public void displayMag(float[] mag) {
        for(int i = 0; i < mag.length; i++) {
            System.out.println(i+": " + mag[i]);
        }
        System.out.println("length of mag = " + mag.length);
    }

    public void init() {
        Media audioMedia = new Media(AUDIO_URI);
        audioMP = new MediaPlayer(audioMedia);
        play();
    }

    @Override
    public void start(Stage primaryStage) throws Exception {
        groupS = new Group();
        mainS = new Scene(groupS, WIDTH/2, HEIGHT/2, Color.DEEPPINK);
        window = primaryStage;
        window.setScene(mainS);
        window.setTitle(TITLE);
        window.show();
    }

    //audioMP.setVolume(0.02); is low, because I just like to listen in low volume while I listen to other music. (:
    public void play() {
        audioMP.play();
        audioMP.setVolume(0.2);
        audioMP.setAudioSpectrumInterval(0.5);
        audioMP.setAudioSpectrumNumBands(256);
        audioMP.setAudioSpectrumListener(this);
        //AWF_newClass.printOutMagnitudes();
    }

    public void stop() {
        System.out.println("program exited");
    }

    public static void main(String[] args) {
        launch(args);
    }
}

filesandprojectsIguess.PNG

that v7 -> v1 is not accidental. I just made a new package in v7.
if I placed the class just in v7, the error is gone and the music can play, but if the class is inside of v7.v1 then I get that error.

if I placed the class just in v7, the error is gone and the music can play, but if the class is inside of v7.v1 then I get that error.

Then just place the class in v7! Faffing around with IDEs just a distraction from learning a language or API.

ps: putting JavaFX code in init() is generally a bad idea. The JavaFX environment is not fully ready at that time. You are much safer ignoring init()and putting everything in start(...)

This is what I right now have:
Right now I am facing how to make these rectangles make more reactive like they change about 60 pixels maximal higher and I want to make it more than 60 pixels. Now I don't have a question this is just an update for my code.

package com.VINSTORM.bleidorb.AudioWaveFormFX_V1.v_aa;

import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.media.AudioSpectrumListener;
import javafx.scene.media.Media;
import javafx.scene.media.MediaPlayer;
import javafx.scene.paint.Color;
import javafx.scene.shape.Rectangle;
import javafx.stage.Stage;

public class AWF_FX_v1 extends Application implements AudioSpectrumListener {

    public final static String TITLE = "AWF special program";
    public final static short WIDTH = 1280;
    public final static short HEIGHT = 720;
    public static String AUDIO_FILE = "../mp3Music/Cynematic - Waterbased.mp3";
    public static String AUDIO_FILE1 = "../mp3Music/AcerDroid -Skies.mp3";
    public static String AUDIO_FILE2 = "../mp3Music/Capturez - Patterns.mp3";
    public static String AUDIO_FILE3 = "../mp3Music/Kanooli - Instinct.mp3";
    public static String AUDIO_FILE4 = "../mp3Music/RavenKreyn_InTheAir_NCSrelease.mp3";
    public static String AUDIO_URI = AWF_FX_v1.class.getResource(AUDIO_FILE2).toExternalForm();

    private Stage window;
    private Scene mainS;
    private Group groupS;
    private MediaPlayer audioMP;
    private float[] cMag;

//  private Rectangle rect0;
//  private Rectangle rect1;
//  private Rectangle rect2;
//  private Rectangle rect3;
//  private Rectangle rect4;
//  private Rectangle rect5;
//  private Rectangle rect6;
//  private Rectangle rect7;

    private Rectangle[] rect = new Rectangle[8];

    @Override
    public void spectrumDataUpdate(double timestamp, double duration, float[] magnitudes, float[] phases) {
        for (int i = 0; i < magnitudes.length; i++) {
            cMag = magnitudes;
            cMag[i] = (int) cMag[i];
            //System.out.println((i + 1) + ": " + (cMag[i] * -1));
        }
        for(int i = 0; i < rect.length; i++) {
            rect[i].setY(310 + ((cMag[i] + 60) * -1));
            rect[i].setHeight(50 + (cMag[i] + 60));
            System.out.println(i + " setY: " + rect[i].getY());
            System.out.println(i + " setHeight " + rect[i].getHeight());
        }

//ignore these comments down below, I tried two times how I did the rectangles thingies.        

//      //second try failed...
//      
////        rect0.setY(HEIGHT / 2 - 50 + (60 - cMag[0]));
////        rect0.setHeight(50 + (60 - cMag[0]));
////        System.out.println("rect0.setY: " + (HEIGHT / 2 - 50 + (60 - cMag[0])) + "\nrect0.setHeight: " + (50 + (60 - cMag[0])));
////        
////        rect1.setY(HEIGHT / 2 - 50 + (60 - cMag[1]));
////        rect1.setHeight(50 + (60 - cMag[1]));
////        System.out.println("rect1.setY: " + (HEIGHT / 2 - 50 + (60 - cMag[1])) + "\nrect1.setHeight: " + (50 + (60 - cMag[1])));
////        
////        rect2.setY(HEIGHT / 2 - 50 + (60 - cMag[2]));
////        rect2.setHeight(50 + (60 - cMag[2]));
////        System.out.println("rect2.setY: " + (HEIGHT / 2 - 50 + (60 - cMag[2])) + "\nrect2.setHeight: " + (50 + (60 - cMag[2])));
////        
////        rect3.setY(HEIGHT / 2 - 50 + (60 - cMag[3]));
////        rect3.setHeight(50 + (60 - cMag[3]));
////        System.out.println("rect3.setY: " + (HEIGHT / 2 - 50 + (60 - cMag[3])) + "\nrect3.setHeight: " + (50 + (60 - cMag[3])));
////        
////        rect4.setY(HEIGHT / 2 - 50 + (60 - cMag[4]));
////        rect4.setHeight(50 + (60 - cMag[4]));
////        System.out.println("rect4.setY: " + (HEIGHT / 2 - 50 + (60 - cMag[4])) + "\nrect4.setHeight: " + (50 + (60 - cMag[4])));
////        
////        rect5.setY(HEIGHT / 2 - 50 + (60 - cMag[5]));
////        rect5.setHeight(50 + (60 - cMag[5]));
////        System.out.println("rect5.setY: " + (HEIGHT / 2 - 50 + (60 - cMag[5])) + "\nrect5.setHeight: " + (50 + (60 - cMag[5])));
////        
////        rect6.setY(HEIGHT / 2 - 50 + (60- cMag[6]));
////        rect6.setHeight(50 + (60 - cMag[6]));
////        System.out.println("rect6.setY: " + (HEIGHT / 2 - 50 + (60 - cMag[6])) + "\nrect6.setHeight: " + (50 + (60 - cMag[6])));
////        
////        rect7.setY(HEIGHT / 2 - 50 + (60 - cMag[7]));
////        rect7.setHeight(50 + (60 - cMag[7]));
////        System.out.println("rect7.setY: " + (HEIGHT / 2 - 50 + (60 - cMag[7])) + "\nrect7.setHeight: " + (50 + (60 - cMag[7])));
////        System.out.println();
//      
//      //first try failed...
//      
////        rect0.setTranslateY(100 + (cMag[0] * -1));
////        rect1.setTranslateY(100 + (cMag[1] * -1));
////        rect2.setTranslateY(100 + (cMag[2] * -1));
////        rect3.setTranslateY(100 + (cMag[3] * -1));
////        rect4.setTranslateY(100 + (cMag[4] * -1));
////        rect5.setTranslateY(100 + (cMag[5] * -1));
////        rect6.setTranslateY(100 + (cMag[6] * -1));
////        rect7.setTranslateY(100 + (cMag[7] * -1));
////        
////        rect0.setHeight(50 + ((cMag[0] * -1)  ));
////        rect1.setHeight(50 + (cMag[1] * -1));
////        rect2.setHeight(50 + (cMag[2] * -1));
////        rect3.setHeight(50 + (cMag[3] * -1));
////        rect4.setHeight(50 + (cMag[4] * -1));
////        rect5.setHeight(50 + (cMag[5] * -1));
////        rect6.setHeight(50 + (cMag[6] * -1));
////        rect7.setHeight(50 + (cMag[7] * -1));
    }

    @Override
    public void start(Stage primaryStage) {
        groupS = new Group();
        mainS = new Scene(groupS, WIDTH, HEIGHT, Color.DARKBLUE);
        window = primaryStage;
        window.setScene(mainS);
        window.setTitle(TITLE);
        window.show();

        Media audioMedia = new Media(AUDIO_URI);
        audioMP = new MediaPlayer(audioMedia);
        audioMP.play();
        audioMP.setCycleCount(MediaPlayer.INDEFINITE);
        audioMP.setVolume(0.02);
        audioMP.setAudioSpectrumInterval(0.01);
        audioMP.setAudioSpectrumNumBands(8);
        audioMP.setAudioSpectrumListener(this);

//      rect0 = new Rectangle(250, HEIGHT / 2 - 50, 50, 50);
//      rect0.setFill(Color.AZURE);
//      rect1 = new Rectangle(350, HEIGHT / 2 - 50, 50, 50);
//      rect1.setFill(Color.CORNFLOWERBLUE);
//      rect2 = new Rectangle(450, HEIGHT / 2 - 50, 50, 50);
//      rect2.setFill(Color.SPRINGGREEN);
//      rect3 = new Rectangle(550, HEIGHT / 2 - 50, 50, 50);
//      rect3.setFill(Color.YELLOWGREEN);
//      rect4 = new Rectangle(650, HEIGHT / 2 - 50, 50, 50);
//      rect4.setFill(Color.YELLOW);
//      rect5 = new Rectangle(750, HEIGHT / 2 - 50, 50, 50);
//      rect5.setFill(Color.ORANGE);
//      rect6 = new Rectangle(850, HEIGHT / 2 - 50, 50, 50);
//      rect6.setFill(Color.RED);
//      rect7 = new Rectangle(950, HEIGHT / 2 - 50, 50, 50);
//      rect7.setFill(Color.BLACK);

        rect[0] = new Rectangle(250, HEIGHT / 2 - 50, 50, 50);
        rect[0].setFill(Color.AZURE);
        rect[1] = new Rectangle(350, HEIGHT / 2 - 50, 50, 50);
        rect[1].setFill(Color.CORNFLOWERBLUE);
        rect[2] = new Rectangle(450, HEIGHT / 2 - 50, 50, 50);
        rect[2].setFill(Color.SPRINGGREEN);
        rect[3] = new Rectangle(550, HEIGHT / 2 - 50, 50, 50);
        rect[3].setFill(Color.YELLOWGREEN);
        rect[4] = new Rectangle(650, HEIGHT / 2 - 50, 50, 50);
        rect[4].setFill(Color.YELLOW);
        rect[5] = new Rectangle(750, HEIGHT / 2 - 50, 50, 50);
        rect[5].setFill(Color.ORANGE);
        rect[6] = new Rectangle(850, HEIGHT / 2 - 50, 50, 50);
        rect[6].setFill(Color.RED);
        rect[7] = new Rectangle(950, HEIGHT / 2 - 50, 50, 50);
        rect[7].setFill(Color.BLACK);

//      groupS.getChildren().add(rect0);
//      groupS.getChildren().add(rect1);
//      groupS.getChildren().add(rect2);
//      groupS.getChildren().add(rect3);
//      groupS.getChildren().add(rect4);
//      groupS.getChildren().add(rect5);
//      groupS.getChildren().add(rect6);
//      groupS.getChildren().add(rect7);

        for(int i = 0; i < rect.length; i++) {
            groupS.getChildren().add(rect[i]);
//          System.out.println(i);
        }
    }

    public void stop() {
        System.out.println("program exited");
    }

    public static void main(String[] args) {
        launch(args);
    }
}

code without that comments lines:

package com.VINSTORM.bleidorb.AudioWaveFormFX_V1.v_aa;

import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.media.AudioSpectrumListener;
import javafx.scene.media.Media;
import javafx.scene.media.MediaPlayer;
import javafx.scene.paint.Color;
import javafx.scene.shape.Rectangle;
import javafx.stage.Stage;

public class AWF_FX_v1 extends Application implements AudioSpectrumListener {

    public final static String TITLE = "AWF special program";
    public final static short WIDTH = 1280;
    public final static short HEIGHT = 720;
    public static String AUDIO_FILE = "../mp3Music/Cynematic - Waterbased.mp3";
    public static String AUDIO_FILE1 = "../mp3Music/AcerDroid -Skies.mp3";
    public static String AUDIO_FILE2 = "../mp3Music/Capturez - Patterns.mp3";
    public static String AUDIO_FILE3 = "../mp3Music/Kanooli - Instinct.mp3";
    public static String AUDIO_FILE4 = "../mp3Music/RavenKreyn_InTheAir_NCSrelease.mp3";
    public static String AUDIO_URI = AWF_FX_v1.class.getResource(AUDIO_FILE2).toExternalForm();

    private Stage window;
    private Scene mainS;
    private Group groupS;
    private MediaPlayer audioMP;
    private float[] cMag;

    private Rectangle[] rect = new Rectangle[8];

    @Override
    public void spectrumDataUpdate(double timestamp, double duration, float[] magnitudes, float[] phases) {
        for (int i = 0; i < magnitudes.length; i++) {
            cMag = magnitudes;
            cMag[i] = (int) cMag[i];
        }
        for(int i = 0; i < rect.length; i++) {
            rect[i].setY(310 + ((cMag[i] + 60) * -1));
            rect[i].setHeight(50 + (cMag[i] + 60));
            System.out.println(i + " setY: " + rect[i].getY());
            System.out.println(i + " setHeight " + rect[i].getHeight());
        }
    }

    @Override
    public void start(Stage primaryStage) {
        groupS = new Group();
        mainS = new Scene(groupS, WIDTH, HEIGHT, Color.DARKBLUE);
        window = primaryStage;
        window.setScene(mainS);
        window.setTitle(TITLE);
        window.show();

        Media audioMedia = new Media(AUDIO_URI);
        audioMP = new MediaPlayer(audioMedia);
        audioMP.play();
        audioMP.setCycleCount(MediaPlayer.INDEFINITE);
        audioMP.setVolume(0.02);
        audioMP.setAudioSpectrumInterval(0.01);
        audioMP.setAudioSpectrumNumBands(8);
        audioMP.setAudioSpectrumListener(this);

        rect[0] = new Rectangle(250, HEIGHT / 2 - 50, 50, 50);
        rect[0].setFill(Color.AZURE);
        rect[1] = new Rectangle(350, HEIGHT / 2 - 50, 50, 50);
        rect[1].setFill(Color.CORNFLOWERBLUE);
        rect[2] = new Rectangle(450, HEIGHT / 2 - 50, 50, 50);
        rect[2].setFill(Color.SPRINGGREEN);
        rect[3] = new Rectangle(550, HEIGHT / 2 - 50, 50, 50);
        rect[3].setFill(Color.YELLOWGREEN);
        rect[4] = new Rectangle(650, HEIGHT / 2 - 50, 50, 50);
        rect[4].setFill(Color.YELLOW);
        rect[5] = new Rectangle(750, HEIGHT / 2 - 50, 50, 50);
        rect[5].setFill(Color.ORANGE);
        rect[6] = new Rectangle(850, HEIGHT / 2 - 50, 50, 50);
        rect[6].setFill(Color.RED);
        rect[7] = new Rectangle(950, HEIGHT / 2 - 50, 50, 50);
        rect[7].setFill(Color.BLACK);

        for(int i = 0; i < rect.length; i++) {
            groupS.getChildren().add(rect[i]);
        }
    }

    public void stop() {
        System.out.println("program exited");
    }

    public static void main(String[] args) {
        launch(args);
    }
}

Nailed it :D

package com.VINSTORM.bleidorb.AudioWaveFormFX_V1.v_aa;

import javafx.application.Application;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.media.AudioSpectrumListener;
import javafx.scene.media.Media;
import javafx.scene.media.MediaPlayer;
import javafx.scene.paint.Color;
import javafx.scene.shape.Rectangle;
import javafx.stage.Stage;

public class AWF_FX_v5 extends Application implements AudioSpectrumListener {

    public final static String TITLE = "AWF special program";
    public final static short WIDTH = 1280;
    public final static short HEIGHT = 720;
    public static String AUDIO_FILE = "../mp3Music/Cynematic - Waterbased.mp3";
    public static String AUDIO_FILE1 = "../mp3Music/AcerDroid -Skies.mp3";
    public static String AUDIO_FILE2 = "../mp3Music/Capturez - Patterns.mp3";
    public static String AUDIO_FILE3 = "../mp3Music/Kanooli - Instinct.mp3";
    public static String AUDIO_FILE4 = "../mp3Music/RavenKreyn_InTheAir_NCSrelease.mp3";
    public static String AUDIO_URI = AWF_FX_v1.class.getResource(AUDIO_FILE1).toExternalForm();

    private Stage window;
    private Scene mainS;
    private Group groupS;
    private MediaPlayer audioMP;
    private float[] cMag;
    private short power = 5;

    private Rectangle[] rect = new Rectangle[40];

    @Override
    public void spectrumDataUpdate(double timestamp, double duration, float[] magnitudes, float[] phases) {
        for (int i = 0; i < magnitudes.length; i++) {
            cMag = magnitudes;
            cMag[i] = (int) cMag[i] * power;
            System.out.println("cMag (" + i + "): " + cMag[i]);
        }

        for(int i = 0; i < rect.length; i++) {
            rect[i].setY(500 + ((cMag[i] + (60 * power)) * -1));
            rect[i].setHeight(50 + (cMag[i] + (60 * power)));
        }
    }

    @Override
    public void start(Stage primaryStage) {
        groupS = new Group();
        mainS = new Scene(groupS, WIDTH, HEIGHT, Color.DARKBLUE);
        window = primaryStage;
        window.setScene(mainS);
        window.setTitle(TITLE);
        window.show();

        Media audioMedia = new Media(AUDIO_URI);
        audioMP = new MediaPlayer(audioMedia);
        audioMP.play();
        audioMP.setCycleCount(MediaPlayer.INDEFINITE);
        audioMP.setVolume(0.02);
        audioMP.setAudioSpectrumInterval(0.01);
        audioMP.setAudioSpectrumNumBands(40);
        audioMP.setAudioSpectrumListener(this);

        for(int i = 0; i < rect.length; i++) {
            rect[i] = new Rectangle();
            rect[i].setX(250 + (i * 20));
            rect[i].setY(500);
            rect[i].setWidth(10);
            rect[i].setHeight(50);
            rect[i].setFill(Color.hsb((360 / 40 * i), 0.8, 1));
            groupS.getChildren().add(rect[i]);
        }
    }

    public void stop() {
        System.out.println("program exited");
    }

    public static void main(String[] args) {
        launch(args);
    }
}