Done, for now (except for some flux cleaning). I find building multiple copies a bit therapeutic; the second one is always easier, and the third one easier than the second, etc, which feels like progress. This time I ended up with 4× small mikrophonie amplifiers.
Now back to the more serious yellow things 
EDIT: Also a shoutout to @analogoutput who called my attention to the Mikrophonie, via his Kosmo-compatible Mikrokosmos design. If you do Kosmo, go get one of those.