[Ketho]

You could maybe temporarily enable all sounds when an addon's sound file is playing as a workaround

local function DisableSound()
    SetCVar("Sound_EnableAllSound", 0)
end
 
--[[ posthook does not seem to work
hooksecurefunc("PlaySoundFile", function()
    SetCVar("Sound_EnableAllSound", 1)
    C_Timer.After(3, DisableSound)
end)
]]
 
local oldPlaySoundFile = PlaySoundFile
 
function PlaySoundFile(...)
    SetCVar("Sound_EnableAllSound", 1)
    C_Timer.After(3, DisableSound)
    oldPlaySoundFile(...)
end
 
DisableSound()