I have an old copy of this book, which you can find for about $20, and it’s excellent! https://encyclotronic.com/books/theory/synthesizer-basics-the-editors-of

I have an old copy of this book, which you can find for about $20, and it’s excellent! https://encyclotronic.com/books/theory/synthesizer-basics-the-editors-of-keyboard-magazine-r18/ https://encyclotronic.com/books/theory/synthesizer-basics-th...