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This made one of the most "ambient" sounds I've gotten out of OP-1 so far. It's like getting an entirely new synth engine. (Am I exaggerating? Try it, tell me what you think. Add Grid for additional awesomeness.)
Interestingly, I was not able to reproduce this on some of the other engines I tried. It seems like the effects of modulating the green channel are different for each engine... except I know that when using other mod sources it always changes pitch.
Another thing I found out is that "microphone" mod source does not necessarily get its sounds from the physical microphone. It is whatever you choose in the "microphone menu". Maybe it is obvious for other people, but it really surprised me in a pleasant way. This means microphone is not just one mod source, but three. And radio is a really cool way to modulate, especially if you tune into some talking channel.
Now, I have two questions. What is sigma LFO source? What is "note with speaker" LFO destination, really? It behaves so differently in different contexts...