Fran, I'll test that poly issue out after dinner. Always fun to see how much a keyboard can take in terms of poly It doesn't have an audio input jack. Would be nice though. Also.., it doesn't have L/R outputs either. Just the typical Yamaha headphone/output jack, BUT this unit has midi I/O jacks, unlike some of the other models Yamaha has decided to drop this most BASIC feature. Sure USB can be nice, but it's not nice when you want to control an external board that has midi jacks.

**Again, consider the price of this thing. For $299 it's a bargain**
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GEAR: Yamaha MOXF-6, Casio MZX-500, Roland Juno-Di, M-Audio Venom, Roland RS-70, Yamaha PSR S700, M-Audio Axiom Pro-61 (Midi Controller). SOFTWARE: Mixcraft-7, PowerTracks Pro Audio 2013, Beat Thang Virtual, Dimension Le.