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Lua has no access to sound and there are no hot keys in game for altering sound settngs so any solution would have to be outside the game, most likely from your audio control panel or a physical switch - I use a switch to swap between external speakers/mic and headphones (both the speakers and the headphones plug into the switch which is then plugged into the computer). A switch won't work in your case since your speakers plug into the sound card and your headphones are USB - you'd have to change to headphones that can plug into a switch.
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