Some games do not run with the error Imuse Initialization device not avaliable.
I have tested the standalone version of Scummvm and the games work perfectly.
In previous versions of the core these same games worked without problem. I don’t know since which version of the core this problem has occurred.
Today I updated to version 1.20 of Retroarch and reviewing my game library I discovered this error. I haven’t found any information to solve it.
Which games (and version) are exactly involved? What platform are we talking about? Which version of the core are you using? Are you testing with the daily version of standalone scummvm or official release? Also a retroarch.log with debug level set both for frontend and core is needed.
I suggest to open an issue here with as much info as possible to handle this (or any other issue) properly.
Also please provide your scummvm.ini from retroarch system folder.