Hi and thanks for your question! MIDI Designer is fully bidirectional with all types of MIDI messages. The problem will be getting Audiomulch to send back. What platform are you running Audiomulch on? If it's Mac or PC, could you possibly get a MIDI Monitor (snoize midi monitor on mac or midiox on pc) to see what's going on? In many programs, it's just a matter of flipping a switch for outputting MIDI.
Thanks!