MOTM

Thanks for taking the time to do that! It gives me some idea on how it 
sounds, it definitely accomplishes the goal of showing each filter in 
the same context. According to this ms-20 video: 
http://tv.sonicstate.com/play.php?vid=296 (2:25)...

...according to that video, the ms-20 is known for being abrasive 
because of its ability to feedback into itself. Your audio demo shows 
that all those filters can be at least a little aggressive. What 
Koos's audio demo is helping me realize is that I have the wrong 
mindset about filters. First of all, by feeding ANY filter into itself 
will cause it to become wild (in my experience). Therefore, I 
shouldn't look for the craziest filter, because all filters can become 
nicely crazy under the right circumstances. BUT! The quality of a 
filter lies within its NON-crazy zones, doesn't it? Then again, some 
filters have a distinct growl that I like, the 490 for example. In 
this video: http://tv.sonicstate.com/play.php?vid=163 (4:52)...

...in that video you can hear the lowpass growling/screaming/self-
oscillation. I'm sure the 420 can sound like that. Koos, I think I 
gave you the idea that you should have the gain so high that it 
overpowers the resonance.

ANYWAY, the point is... I don't think it matters what filter I get, 
I'm sure they all sound great. 490 and 420 (as far as I know) have the 
growl I like. 420 is a good choice... Knowing how crazy the A-106-1 
Xtreme Filter is, it would make a horrible choice as my only filter. 
Hopefully the 485 not so crazy that it would make a bad choice as my 
only filter. My conclusion is that I'm going to take a risk and build 
two 485s.