Sorry for not responding sooner. I stopped getting emails saying that there were new posts to the forum. I now have to check manually.
THE MODERATORS: Pleas give your input as I would like to know this as well…
I have searched and found no way to get the Guitar Midi App to send the app audio directly to an audio track in Garageband. This would need to be done in the Midi App, and Garageband views System Sounds as the Audio interface (Scarlett etc) not the MIDI Guitar app. The DAW Audio Unit Plugin version will most definitely be able to use the sounds by the MIDI app as it is a plugin within Garageband itself and so not viewed as an external app at all. Of course that is more money. And you aren’t satisfied with things yet so not a solution.
There is definitely a way to do this on iOS (Inter App Audio) but I can’t find a way on Mac OS.
I think there is a solution for you and this software does work. I suspect it is more of a sound level issue.
I can say that I have owned a German made Terratec Axon AX100 Midi converter for guitar and have the Roland Midi guitar pickup. It was the fastest dedicated conversion equipment you could buy at the time. It cost over $1500 complete in Canada. I just put it in a box after trying this app and am very satisfied. It does things better and easier than all that gear.
I know with the MIDI Guitar software a big part is the signal strength balance. Not the volume on your guitar but the Gain on your input device, Make sure it is Just short of bouncing into the Red.Try it that way and hen lower it gradually to test responsiveness. Also try high Gain and lowering the volume on your guitar. I find it works best for me at a lower guitar volume as my pickup is high output. (so a cleaner guitar output and a louder signal from the Scarlett)
Like my old AXON and this new app… the app is listening for sound. if the signal is too quiet, it skips motes, if it is too loud it takes harmonics and resonance as notes. If it is to distorted or saturated it can’t differentiate and falsely interprets things.
wishing you the best with this.