Bernie,

If I recall, the S910 does NOT have an auxiliary output, therefore you'll need to use a dead-head jack in the headphone out. However, if you wish I can make you one that will not protrude and sits flush with the cabinet. Let me know.

Gary cool
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!

K+E=W (Knowledge Plus Experience = Wisdom.)