[it's about to get very nerdy here; skip notes if you don't care about the details]
Another persistent weird idea: Sampling my voice and turning it into an instrument using granular synthesis, and running the whole thing through a nice lush reverb. MIDI CC messages can be used to control the granular synthesis parameters. For now, I stuck with the mod wheel controlling the grain duration.
This is just a proof of concept. I plan to flesh this idea out some more in the weeks to come.
I will post the code as soon as I have cleaned it up a bit.
edit 2021-03-08: Code is here: http://sccode.org/1-5eG