Doepfer

code_pig@y...> wrote:
> using a true Sallen-Key 
> filter for bandpass purposes isn't really advised, as the input 
> resistor is a very low value, and changing the value also 
changes the 
> overall behavior and characteristics of the filter.

thanks kevin,

interesting..

actually, i think i misarticulated by saying 'fuzzy bandpass' ..what i 
meant was more general, like a fuzzy midrangy mellowness. 

..looking at the ms20, it has a LP and a HP (no BP) so adjusting 
the 2 filters towards each other (in series) is what gave me a  
band pass.   and of course if  i continue turning the knobs this 
direction the cutoff freqs overlap and the filters cancel each other 
out.  so this is what i was referring to when i mentioned the 
pleasant bandpass sound..all that stuff in between.

also, maybe worth noting that neither filter is multimode, both 
fixed mode, so no chance of  bandpass within either sallen-key 
circuit.  perhaps the risky sallen-key / bandpass scenario you 
mention is a reason the two korg filters are configured the way 
they are.  

i really like the 2 pole..how does this filter-differentiation 
correspond in terms of db slope?   2 pole = (?)db slope?  this 
excursion also perks my interest in the a108..and attention to 
controlling slope in general.
-duff