Thanks a lot herr_prof for the adapter explanation and catskull for the reference link and altered code!
After relearning and newly learning a bundle about MIDI and Arduino, I've got this code installed and running!
-Installed Teenseyduino
-Set board to Teensy LC and USB Type to MIDI
-Cleared EEPROM with the first sketch and installed the Arduinoboy with altered mGB channel with the second sketch
I agree profusely on getting more fanciful equipment as I go, I'm glad this gives me a good base to learn off of for a start.
Last, for changing the mGB channel options again in the future, this was the line you changed right catskull?
1, 2, 3, 4, 0, //mGB midi channels (0-15 = 1-16)