decay nosie problem on xp-60

Hello!
I have a xp-60 and i have a problem: decay noise problem at the end of the sound (on patches of a lot sustain).What is wrong? What can i do?
Thanks

I have the same problem with my XP80. All of the sounds have a slightly dubious decay if you listen carefully enough it seems.

The synthengine is adding a bit of noise to the sound but you ony hear it when sound is low.

Try not to gain the tones too much in the WG.
6 is ok but 12 is too loud.
12 is ok for drums and sound with short decay and release. The effectengine can add some noise too.