Oh no, I can't believe I never thought of this. TAPESTREA totally uses
ChucK as a DSP engine for all sorts of stuff. That's basically what
I'm talking about, too. Thank you Internet.
I believe it was said the Smule uses a embedded version of ChucK. Probably that only refers to parts of ChucK; I don't think there would be a need for FM piano's or models of sitars in those...