Hi Gang,
While there may someday be even more ways to do this, the next Sub 37 update’s CV MAPPING feature will allow you to use a Sustain Pedal in the GATE IN jack to control the OSC 2 ON parameter.
Depending on whether you use a Normally Open (N.O.) or Normally Closed (N.C.) pedal, you’ll be able to turn OSC 2 ON or OFF at will.
This is a reasonable solution for those who don’t want OSC 2 to join OSC 1 when you go from playing two notes to only playing one note. Simply use the Sustain Pedal to make OSC 2 sound only when you want it to.
If you don’t already own one, now is the time to get a Sustain Pedal that has a N.O./N.C. switch, 'cause you’re going to want one right after you install the next update for this and many other GATE IN destinations!