I just loaded MIDI Guitar 3.0.63 beta on my Macbook Air M1. I’m using it for Bass. I noticed that setting up folders for Reverb IRs and Cabinet IRs did not work. I could set the folders up under Plugins, but nothing showed up when I tried to click on Reverbs or Cabinet from the chain menu. Instead of a list of .wav files it just loaded a generic version of either the cabinet or reverb.
I installed 3.0.61 and setting the folders worked and I was presented with a list of files for both Cabinet and reverbs when clicking on them.
Both versions did work for setting up a NAM model folder and selecting a model, but both failed to properly save the setup for the NAM model in a preset. I could save the preset, but trying to recall it would result in a notice that there was an unsupported plugin and the NAM model would be gone. A workaround was to use the NAM plugin from Steve Atkinson which worked and could be recalled after saving a preset.