You can make the sound disappear in either configuration.

The test is whether you can hear TWO separate bands of audio
passing thru the filter combination (high and low), or just ONE. If
two bands, the filters are in parallel - a notch filter configuration;
and if one band, they're in series - a bandpass configuration.

Hope that helps.

Joe

--- In Doepfer_a100@y..., "duffnuff" <duffnuff@h...> wrote:
>
> > Anyonr out there want to help clear up how the Korg MS20
> filters can
> > be configured
>
> i'm playing one now..and as i've mentioned repeatedly, if you turn
> the HP and LP cutoff freqs against each other the sound
> disappears. this could not occur if they were in parallel.
>
> i don't have any doubts as to how it's configured (they're in
> series), i just didn't know what type of filter it is or what slope
it
> has. now i'm very happy to know! thanks..
>
> -duff