I now have a Yamaha DX7, and a Yamaha DX7IIFD with Grey Matter E! Card, and a Yamaha TX816 Midirack and an assortment of cartridges. I am working to learn how to create new patches for the DX7. My notes on Yamaha equipment, including the DX7.

Note: My DX7IIFD includes a Grey Matter E! Card. So that may change many of the procedures.

• Discussion about E! Card: https://groups.google.com/g/comp.music.midi/c/_UAc2kUsr24?pli=1
• Manual https://wwwuser.gwdg.de/~gschuma1/download/E!_for_the_YAMAHA_DX7II_series.pdf