Hi Rhumba, Congratulations on getting the Bose PAS, and which I assume includes the GC 30 day return option if desired as well.

I'm particularly anxious to get your candid feedback on how your Yamaha S90 keyboard's 'stereo sampled' acoustic piano voices sound, when played solo, and mixed to mono to a 'single' Bose PAS unit. How much (if any) sound degradation occurs, from the effects of phase cancellation?

Would be interested in having you evaluate and compare going out from the S90's left (L/L+R) ouput only to the PAS, then going out the S90's (R) ouput only to the PAS, followed by going out separately from both the S90's (L/L+R) and (R) outputs to two separate inputs on the PAS.

Also interested in hearing how easy & quick it is to transport, setup, and breakdown. Looking forward to your review. - Scott