HI GANG! I hace a JUNO D8. It's great! Each user scene can layer up to 7 sounds (8th being drums). Does anyone know if there's a way to manually, on the fly, control the volumes on, at least PARTS 3 and/or 4? The two volume sliders are good for PARTS 1 AND 2, BUT NOT the other parts. It would come in handy if you could program a knob or a slider to control another PART. Anyone?