Haven't had much time to work on this recently but I've come to a few conclusions. I am fairly certain that the synth is not even trying to load the sound patches, and instead the load button triggers the verify action. When I compared behaviors between load and verify, both displayed the exact same...

All synths that used tape interfaces are very sensitive to the level. Try lowering the volume out of your computer. I'll give it another shot soon here but I did try a pretty wide range of volumes the first go around. Often the lower volumes would display ERR immediately, while higher ones would ge...

Discovered something about the second issue where it resets the program. There are two keys in the board which do not cause this (the first two C keys), while the rest do, so I'm guessing something with the I/O is messed up.

Recently picked up a Poly 800 for quite cheap. It didn't make any sound and the CR2032 was disconnected inside, so I replaced the battery and soldered in a new holder. However, I can't seem to load in the sound data. I have a .wav file with the data and am following the instructions in the manual, b...