Tried this per Arsonium's post in that aforementioned linked Steam Community thread: `WINEPREFIX=" /steamapps/compatdata/650670/pfx" winetricks dmsynth gmdls directmusic` This unfortunately did not work. But... it DID wo...
This _MIGHT_ not be a mouse error but perhaps actually related to the music subsystem, for two reasons: 1) I booted into Windows to play it, and MIDI music plays during the main menu, a detail I'd forgotten about with th...
Tried this again. The mouse problem still happens with the newest "Proton Hotfix" as well as "Proton 10.0-3" (edit: and, yes, "Proton Experimental" too)