- Square wave instrument #80
- Saw wave instrument #81
- Ocarina instrument #79 is de-facto close to sine wave on most synths
However the largely supported Roland GS or Yamaha XG extensions allow for the following
- "Square wave 2" instrument #80 bank #1
- "Sine wave" instrument #80 bank #8
- "Saw wave 2" instrument #81 bank #1
I figured out that for some reason relative to the fourrier spectrum, it is easy to simulate a 75% duty cycle pulse wave, by adding two square waves : One for the fundamental and the second one one octave upper at 70% of the volume.
I wonder whether it's possible to use a similar trick to simulate a 87.5% duty cycle pulse wave in extended GS/YM MIDI. At the absolute worst that should be possible by stacking up enough sine wave harmonics, but I wonder whether there's something better.