I'm having problems with the music volume constantly being too high... I lower it in the settings, but a few minutes later it seems to climb back up to uncomfortably high levels. It seems it resets back to the previous volume with every new room I move to. Has anyone else experienced this?

Try setting the volume in the ScummVM menu instead of the in-game one. The settings in both menus are supposed to be linked and change together, but it's still worth a try.

Instead of pressing F5, use CTRL+F5 and use the Options button in the menu that appears. Set the volumes you want there; the sounds and voices volume can also be changed, and all are independent from each other.

BTW, next time I recommend creating a new topic, necroing is frowned upon in these forums.