Got it. Yes, the jumpers are all in place. Right now I have music I recorded with a little Fostex on Tracks 8, 7, 6, 5, and 4 playing back off the 80-8 through the 520.
I did the “RECOMMENDED 8 TRACK BASIC PATCH” shown on 36 of the actual original M-512/M-520 Operation/Maintenance manual that...