We did experiment a bit with a one-button approach for both record and play, but it wasn’t immediately obvious to me how it should work. I guess “long press” would start recording after half a second or so, but you kind of loose the timing then?
Related: There is some argument for “starting recording when you play the first note”, but in a way that somehow preserve the loop timing. I think way to implement this, is to skip any number of initial loop rounds of recording silence. That will almost feel like it wait recording until you play the first note, but with timing intact.
I just got one of these, and if its able to send out any kind of MIDI/Sysex or other kind intelligible data, I’ll make it work out of the box, without flashing the EPROM: