extract VolumeChanger folder into your Modules folder
and add the path in SWRSToys.ini just like other mods

VolumeChanger=Modules/VolumeChanger/VolumeChanger.dll
"modules\\VolumeChanger\\VolumeChanger.dll":{"enabled":true},


VolumeChanger mod allows you to change the BGM and SE voulume anytime you want instead of only in Config menu.

The default hotkeys are "Ctrl+M" to increase BGM, "Ctrl+N" to decrease BGM, "Ctrl+B" to increase SE, "Ctrl+V" to decrease SE

You could set the hotkeys in VolumeChanger.ini