Yamaha S90XS Problem

I bought the Yamaha s90 xs a few months ago. I am overall impressed with it, but there seems to be
a sound quality problem with all piano sounds.
Maybe you can try doing this on your keyboard:
Play a loud octave low on the piano;
Quickly, play the same octave, quitely, and rapidly hit both notes, gradually getting louder and louder.
Everytime i do this, it sounds as if I am playing too many notes for the system to handle....it suddenly cuts out parts of the sounds.  As you can see, it is very hard to explain! sorry.  It is kind of frustrating, because I have to be careful when recording not to allow this to happen.
Do all keyboards do this? I was surprised that a 3000 dollar keyboard would have this problem....should I take advantage of my warranty in this situation?

thank you

thank you for your help......
i was able to update my keyboard, but the problem was not fixed
click here to here my problem

I think that you may be exceeding the polyphony limit of the S90.  Even though you've got 128 tone generators, it's easier to run out than you think. 

I'm assuming that you're running your test sustain pedal down.  You didn't say which mode you're using.  Perfomance mode eats voices like popcorn.  Let's assume that you're in Voice mode and are using a piano patch with 4 elements.  Each time you play an octave, that's two notes times 4 elements = 8 tone generators.  After 16 repetitions, you're out of tone generators and the S90 starts deallocating voices from the earlier notes and giving them to the new ones. 

The voice mode scenario is the best case, because some of the other modes either consume more voices or may reserve voices, meaning that you might run out well before 16 reps.  When you run your test, count reps until you hear voices drop.

The S90 has lots of options.  (Too many for my taste.  I wasn't a fan when I owned one.)  You should make sure that you're not operating in a mode that reduces or reserves polyphony.

Your test is a tough one because the lower octave have longer sustain which means that you're more likely to hear voices when they drop out.

To answer your questions, yes, all keyboards do this.  It's that the number of reps differs depending on polyphony, patch, mode, and settings.

Murray

try this link
www.wix.com/tylerlinahan/keyboardproblem

My keyboard is not connected to my pc at all...I usually play my keyboard listening with my headphones...
This only happens with the piano sounds.

Is it possible to make the polyphony unlimited, or larger?

I actually tried doing this on the guitar sound, and the same thing happens, except I can barely hear it; It's not really noticeable.
Besides that, I think it just happens with all of my piano sounds. (except 1)
By the way, this only happens on the LOWER part of the piano.  This does not happen anywhere else on the piano...

Thank you so much for your help!

I actually tried the Factory Reset too... but nothing seemed to work.  Thank you for all of your time! Maybe I can call Yamaha and discuss it with them on the phone.

Does anybody have any ideas if the 2nd to lowest octave from D to C plays multiple notes on each key? It's that octave only.