“This is my Yamaha DX7 IIFD with the Grey Matter E! expansion. I’ve had this in my smoke free studio for 5 years (since buying it) and it’s never moved.
The battery replacement mod was done and I swapped out the battery about 2 years ago. It’s very easy to do if the battery fails again.
All the switches/buttons/keys and outputs work as expected. The Grey Matter E! section is in the menu and appears to be working normally but it’s a bit arcane to me. The sound engine works normally with dual/split patches and editing working as expected.” Click here to visit listing on eBay