OTAs or operational transconductance amplifiers are commonly used in analog synths for a variety of purposes. Most commonly they are used as VCAs. After all, how would you make a VCA with standard op-amps? I graduated with an electrical engineering degree without ever hearing about OTAs. Then again, I could say that about a lot of things. I digress. We must teach ourselves about these triangles.
I was first shown the ways of the triangle by Prof. Aaron Lanterman's online videos of his Electronics for Music Synthesis class at Georgia Tech. See session 6 and 14. That would be a good place to start if you're like me and you long for the days of sitting in a classroom watching somebody solve a math problem. If only those problems were about synthesizers. Well now they are!
If you're more hardcore, check out the application notes for the CA3080. These are filled with all kinds of good information if you can actually stand to read them. When you're finished, put down your pencils and I will continue.
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