Your add-on is fantastic! Would it be possible to add a configuration option that allows users to select the output channel? This way, it could be muted when the in-game sound is disabled.

Nothing planned, this addon doesn't really have any UI to configure things beside what BigWigs offer. If you want it to play everything as sound effect, you can edit Interface\Addons\BigWigs_Voice\Core.lua and change Master to SFX as a workaround.