Hi Dave. The Tyros has Sub outputs- "2" of them - but no Fixed Level or regular Aux Ouputs. I doubt very seriously if you could use the Sub outputs for a Stereo Aux output signal. Plus I'd reckon to say they wouldn't be Fixed Level either if you could. Okay, here's the Tyros' output specs taken from the Yamaha US site:

Phones, Line Out Main (L/L+R, R), Sub 1/2
Loop Send (L/L+R, R), AUX In Loop Return (L/L+R, R), Trim Vol.
To Sub Woofer L/R, To Left/Right Speaker
MIC/Line In - Dynamic MIC (Imp. 250 ohm recommended) Trim, Input Volume, Signal/Over Indicator.

No specfic Aux Outputs mentioned.

Best regards,
Mike