I was using the mixer to transpose the step sequencer pitched parts by moving the 'part' selector left of part 1 so it selects 'all' then using 'coarse' adjustment for semitones, then selecting right, to parts 1 and 2 and then using 'coarse' adjustments for those back to the original pitch. It doesn't seem to affect non-pitched drum parts. The transpose keys also work only on the non-step-sequencer parts.