In normal mode, not recording/mute/chromatic, trigs 1-8 will play the default sound of that track when you press them…
For whatever track your working on just press that number trig while changing the note until you hear what you want, then set it back to what it was for your default note, go back to grid recoding and lock the note you found to the trig. You might not have to set it back to your default note until your done with all the ones you want to lock.
Seems like some steps but you wouldn’t have to wait every cycle to hear a different note, I think it might be quicker.