To trigger the hotswitch on an H9 itself, you can either attach an aux switch to the H9 or use MIDI. The hotswitch is programmed in H9 Control by long pressing the hotswitch button. It starts flashing to indicate that its in programming mode, and you can move the knobs to where you want them to be when the hotswitch is pressed. Please check the H9's manual if you'd like to know how to program the hotswitch on the H9 itself.
