Dave Smith Instruments SYNTHESIZERS

Hey, all.  I think I may have the noise bug that some have complained 
about with the Evolver, where above certain osc levels an 
intermittent, unwanted noise is introduced that doesn't seem to be 
related to any other parameters.  If I turn the HPF value way up, the 
noise goes away, but it's otherwise quite persistent.  However, this 
doesn't seem to happen on the presets, so I'm wondering if I might 
just be paranoid - does anyone know of a specific approach to test if 
the evolver has this bug, or specifically what causes it?  I thought 
I'd ask here before bothering Dave.  Thanks much.

Alex