In the event the Audya won't handle two headphones you can always use a headphone amp/splitter. I bought one for $28 for my band with 4 outs. It works great.

Bernie
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pa4X 76 ,SX900, Audya 76,Yamaha S970 , vArranger, Hammond SK1, Ketron SD40, Centerpoint Space Station, Bose compact