For day 3 of my little coding spree, I've got an engine with 2x3=6 square wave channels for you. Sound is a little more rough than in engines of the same type with less channels, but well, that's what happens if you push things. This engine also has variable pulse widths, although less fine-grained than normally.

download (includes XM converter as usual): https://github.com/utz82/ZX-Spectrum-1-Bit-Routines/blob/master/xtone.zip?raw=true
source: https://github.com/utz82/ZX-Spectrum-1-Bit-Routines/tree/master/xtone
release thread: http://randomflux.info/1bit/viewtopic.php?id=39

7days7engines Day 3: xtone test1

1-bit fanatic, sound driver coder, calculator abuser, binary modulation researcher

7days7engines Day 3: xtone test1

irrlicht project