opinions needed...

[Greg Montalbano]

Thanks -- I have to admit I was getting a little curious:  none of the
other responses I've received have mentioned any real use for the hi-pass
filter in synthesis (even though, for years, I've been hearing about how
great it was that the MS-20 or the Oberheim SEMs had these filters).  I
often wondered if they were included in the early synths because they were
familiar devices to the engineer/lab type folks who were putting these
machines together, at a time when the "standard" synthesizer complement
wasn't yet established.

At 10:17 PM 10/9/00 -0700, you wrote:
>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?
>>
>>
>
>
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