Volume on/off key (or command, or widget)?

[Moiren]

would be nice to have a text command personally for volume adjustment instead of going through config.
No big deal going through config but wouldn't be bad to have a text command for it imo.

/volume (bgm/se/...) (0-100) -- /command (which volume) (what %)

Yeah that would be nice too!
Volume text command and toggle key or command

I mean about the toggle option: if your BGM is, for example, 90% and your SE volume is 80%, then switching the toggle off would put them both to 0, but switching on again would put them back to their values (90 and 80).