That's already an option.
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/performsounds
Since people are asking for different options...here's what we have:
/mastervolume
/bgm
/soundeffects
/voice
/systemsounds
/ambientsounds
/performsounds
/soundeffectsself
/soundeffectsparty
/soundeffectsother
For each command, if you use it by itself it will toggle the mute. You can also give it an integer value from 0 to 100.
Using these, you can make sound profiles via macro. For example
Code:/mastervolume 20
/bgm 20
/soundeffects 75
/voice 100
/systemsounds 100
/ambientsounds 5
/performsounds 100
/soundeffectsself 75
/soundeffectsparty 50
/soundeffectsother 0