opinions needed...

[jh.]

Another nice feature of the MS-20 filter pair is that a strong input signal
"overrides" self oscillation at high resonance. I often find myself doing
something like that: LPF set to high resonance (self oscillating without
input signal). Then sending a strong input signal (thru HPF) to LPF,
and the self oscillation is mostly drowned by the input signal. Now
increase the HPF cutoff frequency (i.e. reduce the LPF's input level
"from bottom up") and see how the sound starts to scream as it grows
thinner. Or set the HPF to self oscillation as well, and hear the LFP
starting to scream as the HPF's tone vanishes at the upper end.

JH.



-----Ursprüngliche Nachricht-----
Von: jupiterseries <jupiterseries at netzero.net>
An: <synth-diy at node12b53.a2000.nl>; Greg Montalbano
<Greg.Montalbano at ucop.edu>
Gesendet: Dienstag, 10. Oktober 2000 07:17
Betreff: Re: opinions needed...


> I have always preferred the sound of a sweeping highpass filter over a
> lowpass. It really jumps out at you if you use it in a song. The highpass
in
> the MS-20, if I remember correctly, is in series with a lowpass, so no
> matter how high you turn the cutoff for the low, your still only hearing a
> bandpass. Don't forget, though, if your output waveform's phase is 180
> degrees off from your input to the filter (inverting output), then mixing
> the output of the filter with an equal volume of the original signal would
> cancel the passband and turn a lowpass into a highpass or a highpass into
a
> lowpass.  Anyway - in summary,  I would suggest a highpass, especially if
> your only experience was with the Korg MS-20's filter.
>
>                                                             Jon Sonnenberg
> P.S. I'm not in any way putting down the MS-20. I absolutely love that
synth
> along with the MS-50.
>
> -----Original Message-----
> From: Greg Montalbano <Greg.Montalbano at ucop.edu>
> To: synth-diy at node12b53.a2000.nl <synth-diy at node12b53.a2000.nl>
> Date: Monday, October 09, 2000 4:21 PM
> Subject: opinions needed...
>
>
> >(...I know you folks are usually shy about giving them...)
> >
> >I've been recommissioning my old modular setup, and have
> >one leftover SSM 2040 filter chip for the auxilliary filter module
> >-- was going to implement a simple switchable lowpass/allpass design,
> >when I noticed it would be just as easy to make it a switchable
> >HIGHPASS/allpass design.  I must confess that in all the years I've
> >been noodling around with this stuff, I've never much used highpass (only
> >synth I ever  owned that had one was my old MS-20) -- aside from
> >the obvious bandpass result from combining low & high, is there much
> >use for this mode that I've been missing?
> >
> >Thanks, eh?
> >
> >
>
>
> _____NetZero Free Internet Access and Email______
>    http://www.netzero.net/download/index.html