... , Knobs. 3.PC PC upload and download, compatible with Win XP/Vista/WIN7 and Mac OSX,drive free and hot plug ... supporting4.Interface MIDI interface,USB interface, pedal interface(for a switching or continuous pedal controller ) 5.Power 9-12V power ... ~A4/B1~B4 KnobsAssignable knobs with an independent channel and controller distributed to each Knob. 5SLIDERAssignable fader. Use the Global ...