g0thdetectiv

So the boss effects basically just uses a high pass filter, why couldn't I set this up on the hd500? Is it because its not polyphonic and so the sound is confussed at the point of octaving, rather than the overal sound coming out? In another matter, am I right in saying the dual amp feature allows you to put different effects on the different amps, so I could recreate the royal blood effect using just a hd-500? Thanks!