Roland JV-1010 takes a CR2032 battery

For when I inevitably forget in the future, the Roland JV-1010 MIDI sound module/synth/romper takes a CR2032 battery for its internal memory backup. I just got this thing and I don’t think the battery has been replaced since it was made in 1999!
There was a Toshiba in there so I swapped in a fresh Energizer. Immediately got this message on the display on powering it up:
"und"
...which means "User Memory Damaged". As I started playing piano sounds, the notes sounded like they were out of tune with themselves, like it was in a weird stretch tuning mode. The manual says to restore the factory settings with the Factory Reset procedure when you see the "und" message. Here's how:
- Press the VALUE knob to switch to a mode other than the Patch mode (PATCH), that is, to the PERFORM, RHYTHM, or GM mode.
- While holding down the VOLUME knob, press the VALUE knob.
- Switch to the Edit mode.
- Turn the CATEGORY/BANK knob to choose PIANO (Factory Reset).
- "Fct" flashes on the display.
- In the Edit mode, choosing PIANO (Factory Reset) with the CATEGORY/BANK knob makes it possible to perform Factory Reset.
- Press the VALUE knob.
- "Sur" flashes on the display, prompting you to confirm that you indeed wish to carry out a Factory Reset.
- Press the VALUE knob.
- The Factory Reset is performed, and you leave the Edit mode.