Tried it tonight. Cannot do (at least I can't). When I link up the wireless hand held, the headset goes out and vice versa....
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Live: Korg PA4X/EV Everse 8s/Senn 935/K&M stand

Studio: Korg PA4X/Yamaha DGX670/Boss BR900CD/Tascam DP24SD/MTM Iloud/Sony C80/AGK 214/K&M stand