Pa900 drum kit distortion

[tony mads usa]

I NEED HELP !!! The drums on my KORG Pa900 are making a terrible distortion sound ... I think it is coming from a cymbal ... The attached file is a recording of a Rock style that uses both a 'Standard' drum kit and a 'Percussion' kit ... If you listen, you will hear the distortion in the beginning and then at about 18 seconds in I muted the Percussion kit and the distortion disappears ... later, when I 'unmute' the Percussion, the distortion returns. The problem is not confined to Percussion kits, as it happens when a style is using only a 'standard' kit ... Also, it doesn't happen with every style, so it must have something to do with the 'pieces' i.e. snare, hi hat, crash cymbal, etc. that make up the kit used in the style. I've also tried changing global EQs with no success, and it does not have anything to do with the volume on the KB. I am hoping someone on this board can help me out. I have never 'dug into' the kits, and would not even know where to start. Thank you in advance.
https://app.box.com/s/zq8lmwaddegajzaf0rg50t611zraaptu

[tony mads usa]

I was just playing the Zydeco style and got the same distortion, but this time it was from the 'Fiddle" sound ... perhaps it has something to do with the audio frequency of the 'note (s)' being played ?!?