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<p>I traced the ladder inputs from my modular, the 303 filter was similar:</p>
<a href="http://s270.photobucket.com/user/Shudder11/media/moog_hp.jpg.html" class="OWAAutoLink" id="LPlnk706477">http://s270.photobucket.com/user/Shudder11/media/moog_hp.jpg.html</a><br>
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<p>The notch is a simple grounded wiper on a pot with associated resistors. It's pretty boring TBH, a switch or cascading 2 like the MS20 would be more useful.
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<div id="x_divRplyFwdMsg" dir="ltr"><font style="font-size:11pt" color="#000000" face="Calibri, sans-serif"><b>From:</b> Synth-diy <synth-diy-bounces@synth-diy.org> on behalf of Gordonjcp <gordonjcp@gjcp.net><br>
<b>Sent:</b> Tuesday, 1 August 2017 8:09 PM<br>
<b>To:</b> synth-diy@synth-diy.org<br>
<b>Subject:</b> Re: [sdiy] HP from LP ?</font>
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<div class="PlainText">On Tue, Aug 01, 2017 at 12:10:48AM +0000, Sean Ellis wrote:<br>
> I have seen a way to inject the signal into the ladder to get a highpass response, Tom Gamble was the first person I saw do this but I cant find the original message (was on SDIY sometime around 2000). I have gotten highpass from the 303 filter in the same
way:<br>
> <br>
> <a href="https://soundcloud.com/tensiontype/303-highpass1" id="LPlnk863782" previewremoved="true">
https://soundcloud.com/tensiontype/303-highpass1</a><br>
> <br>
<br>
Well hang on, how does it work in the Sallen-Key topology like in the<br>
Steiner Synthacon? I know that's not a ladder - it looks like one<br>
opened out flat to balance the diode chain, but it's fed differently -<br>
but there must be some way to do it.<br>
<br>
The neat thing about that is it has both lowpass and highpass *inputs*<br>
so it can act like a kind of frequency crossfader:<br>
<br>
<a href="http://gjcp.net/mp3s/hilow.ogg" id="LPlnk851789" previewremoved="true">http://gjcp.net/mp3s/hilow.ogg</a><br>
<br>
-- <br>
Gordonjcp MM0YEQ<br>
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