How do I make a MMControl to decrease the Volume and Increase volume

[Bile]

-->>I'm trying to make a simple Audio player and so far I'm good.
-->>The problem I'm facing is redusing and increasing the Volume.
-->>Any ideas please...
-->>Thak you.

[Minimalist]

You will find an example with explanations here:
http://support.microsoft.com/kb/118377

[Bile]

-->>Thank You Minimalist for the Information,I tried it and I have a problem..
-->>though I get an Error saying "Run-time Error '48':"
-->>"File not found:MMSYSTEM.DLL"
-->>Itried to check for the file on System32 it was there!!!...
-->>Tried to run regsvr32 to register it then I got a RegSvr32 saying:-...
-->>The module "C:\Windows\System32\MMSYSTEM.DLL" may not compatible with the
-->>version of Windows that you're running. Check if the module is compatible
-->>with an x86 (32-bit) or x64 (64-bit) version of regsvr32.exe
-->>Then I got stuck there,but sorry if I forgot to mention this I have an...
-->>MMcontrol on My form so is there a way I can use it to control the Volume?
-->>Thanks...

[Minimalist]

Here you find a lengthy article about some of these eroors and how to fix these. Good luck
http://pcsupport.about.com/od/findbyerrormessage/a/mmsystem-dll-not-found-missing-error.htm