Dave Smith Instruments SYNTHESIZERS

HI everybody,
I bought a beautifull brand new PEK a few weeks ago, enjoyed its 
wonderfull rich and deep sound until I discovered that with some 
factory patches, I couldn't use the HPF together with Distortion 
without hearing an horrible digital noise & distortion. For example, 
if I try to edit the Patch 10 Bank 1, I can tweak the HPF or the 
Distortion parameters alone but if I try to use both (even at a 
setting of 1 for the HPF and 2 for the Distortion), then I just get 
an awfull digital noise/distortion which is as loud as the "normal" 
patch sound!!
I'm currently in relation with DSI Support, but I'd like to know if 
someone already experienced this issue (or others) with their PEK 
before. My PEK is certainly an early one because its serial number is 
only a two digits one... Its firmware versions are:
Main   v1.00
Voice  v2.00
DSP    v3.00. (You can know this by pressing the Reset button 
together with button 1 from the keypad.)
Another question: The Clip LED is only relevant for the Voice 1 on my 
PEK. The 3 other voices never drive it. Is it the same for you all?
Thanks in advance!

Best regards,
Sylvain Dumortier