I run El Capitan but had the same problem with prior operating systems. I can't use the single quote key to type a straight quote mark in the apps that I want, in particular an abc notation app called EasyABC. Having just stated that I notice the word can't does that a straight quote!!! In EasyABC there is no Substitutions menu so I don't know what to do.

I'm going to write your El Capitan is not a typewriter. Read http://practicaltypography.com/straight-and-curly-quotes.html to learn how to turn on/off smart quotes in Word and ask the EasyABC support/author if they support this.

I'll disagree about Word and straight quotes.

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