I’m pretty certain that the ‘lo’ ‘hi’ designation has nothing to do with ‘suboscillators’, anything audio/synthesis related to the ESQ1/SQ80 or the data content of the rom. I’m more inclined with it is just a convention used to how the rom is mapped. ‘low’ meaning it occupies addresses $0000-$7FFF (hex) and ‘high’ occupies addresses $8000-$FFFF (hex).
I don’t sorry.
IMO surely with the ‘single cycle’ waves you have, you can start a tune which is probably the more important thing I would’ve thought.
Quick example:
sq80tune.xrns (79.1 KB)