Here is a working example of using MG2 (regular AUv2) in Logic Pro 11.2 as a MIDI-controlled effect. Is this what you mean?
FWIW, the plugin depends on receiving audio to convert to MIDI, hence the sidechain input in use here.
I don’t use the MIDI Guitar for GarageBand version, but you do, right? So, is there something stopping you from testing it out for yourself?
