Zack!
I made that mistake last month ... I turned on the psr9000 and was playing a song with SAX in it! It sounded Weird! I thought I had broken the instrument!
I turned it on and off and then back on ...and still sounded Weird! Horrible!

Then I noticed one of the Wheels on the far Right of the board was set all the way up...giving lots of vibrito ... turned it down ...and SAX and Trumpet sounded great again!

Now I check when I turn the prs9000 on ...because I cover it at night with a Black Large Towel to keep dust out.... and I guess taking the towel off adjusted the wheel.
rgtaa