MOTM

That is indeed an Electronotes MPWA fed by a bass pitch sawtooth VCO to 
provide the starting point for some subtractive synthesis.  If memory 
serves correctly, the MPWA is followed by a 24db/oct LPF, and a 
bucket-brigade analog delay, both of which are being swept by LFOs.  
There's also some spatial modulation going on.  The "liveliness" is 
provided by the MPWA with its eight internal fixed rate LFOs creating 
eight phase-shifted versions of the input sawtooth, all mixed back with 
the original.  The MPWA had no control inputs.  It had an input jack and 
an output jack, period.  I had a lot of fun with it.  But that synth is 
long gone.  This is one module that hasn't made it into my current synth 
yet.

-Richard Brewster

Scott Juskiw wrote:

>At 3:01 PM -0400 2004/07/07, David Moylan wrote:
>  
>
>>Anyone on the list ever heard this guy in action?  It's basically a
>>chorus circuit which uses 3 phases each of 2 LFOs to phase a single
>>incoming sawtooth 6 ways and combines.  Seems a simple way to thicken up
>>a single oscillator.  Info including schematics (and a MOTM format
>>Schaeffer .fpd) available at this link.
>>
>>http://www.digisound80.synth.net/digisound/modules/80-20/80-20.htm
>>
>>Dave Moylan
>>    
>>
>
>This circuit is very similar to the Multi Phase Waveform Animator 
>(MPWA) from Electronotes. There are several other instances on this 
>theme out there. Off the top of my head:
>
>http://home.comcast.net/~sbernardi/elec/og2/og3_obesifier.html
>http://www.cyndustries.com/modules_sawtooth.cfm
>
>The very notion of "voltage controlled fat" makes me chuckle.
>
>Richard Brewster pasted a link on the ModularSynthPanels group with a 
>sample of his MPWA:
>
>http://groups.yahoo.com/group/ModularSynthPanels/files/Richard%20Brewster%20Designs/Mpwa.mp3
>
>An official MOTM version of this beast would be most welcome.
>
>
>  
>