MOTM

In a message dated 00-03-22 16:17:18 EST, you write:

<< For a modifier, what about something that basically does what a ring
 modulator does (but not through simple multiplication obviously)---change
 the spacing between harmonics plus or minus---but along a controllable
 curve. Is that clear? I'm fumbling for language here. A ring modulator ends
 up expanding or contracting the harmonic spacing in a linear way, and
 because pitch has an exponential relationship to frequency, we get the weird
 metallic non-harmonic sound. What if you could do something similar, but
 with "curves" that could be voltage-controllable? As well as the deviation
 amount? >>



ken,
while this is a "digital domain" implementation, something similar to this 
idea is part of the music360 system they used to use at the univ. of padua in 
italy. it involved multiplication with a variable ( and time variable, too, 
if desired ) exponent factor to create complex timbres. apparently, it worked 
pretty well.
so, maybe the hypothetical module could have a v.c. exponentiation factor ? ( 
multiply by . whatever to 1 to 1.5 to whatever else over a 0 to 5 vdc control 
range.
best,
dave v.

In a message dated 00-03-22 16:17:18 EST, you write:

<< For an additive source module, I guess some kind of high-frequency VCO that
 feeds, say, eight "divide-by-N" chains that can divide by large numbers. >>


ken,
going from this back to the "simpler" ( ? ) idea of using a sequencer :
( as i recall, you were familiar with serge stuff like the "tkb" and for 
whatever reason, i can visualize this easier in terms of that unit )
clock it at a superaudio rate so when divided down, you are in the audio 
range. then, instead of using the row voltage output, take the gate output ( 
there`s one for each of the 16 stages ), think of the gate as being a fixed 5 
volt steady state. feed each gate into a vca tuned to function best with 
control voltages. now, modulate those vca`s in various ways, envelopes or 
audio rate, whatever.  sum those modulated outputs in another mixer / vca 
type module. i would think that the varying level of each stage, when clocked 
at the audio rate to use the sequencer as a "vco" would produce a complex 
dynamic spectrum.  or am i crazy ( not to be ruled out ! ) ????
best,
dave v.

In a message dated 00-03-22 16:17:18 EST, you write:

<< wonder what that first module
 would sound like.  >>



ken,
i`m not sure but if "doable'" as an analog module, i think it might have 
interesting possiblities ! okay, engineering types, is there an inexpensive 
exponentiating  ic out there ? could it be adapted to this sort of use ?
best,
dave v.

So you'd be directly controlling the waveshape? That could be interesting; I
don't think you'd get direct control over the partials that way but it could
probably make some cool new waveforms.

 -----Original Message-----
From: 	davevosh@... [mailto:davevosh@...] 
Sent:	Wednesday, 22 March, 2000 11:12 PM
To:	motm@onelist.com
Subject:	Re: [motm] Partially Mad



going from this back to the "simpler" ( ? ) idea of using a sequencer :
( as i recall, you were familiar with serge stuff like the "tkb" and for 
whatever reason, i can visualize this easier in terms of that unit )
clock it at a superaudio rate so when divided down, you are in the audio 
range. then, instead of using the row voltage output, take the gate output (

there`s one for each of the 16 stages ), think of the gate as being a fixed
5 
volt steady state. feed each gate into a vca tuned to function best with 
control voltages. now, modulate those vca`s in various ways, envelopes or 
audio rate, whatever.  sum those modulated outputs in another mixer / vca 
type module. i would think that the varying level of each stage, when
clocked 
at the audio rate to use the sequencer as a "vco" would produce a complex 
dynamic spectrum.  or am i crazy ( not to be ruled out ! ) ????

JH's interpolating scanner is more suited to this than a sequencer. It
already has the VCAs built in to crossfade from one input to another when
swept by a CV. Also, it has built in normalized DC inputs to the VCAs so
that you can directly synthesize waveforms with arbitrary breakpoints.

http://www.synthfool.com/diy/jh_ipscan.html

Dave Bradley
Principal Software Engineer
Engineering Animation, Inc.
daveb@...

> -----Original Message-----
> From: Tkacs, Ken [mailto:ken.tkacs@...]
> Sent: Thursday, March 23, 2000 7:48 AM
> To: 'motm@onelist.com'
> Subject: RE: [motm] Partially Mad
>
>
> From: "Tkacs, Ken" <ken.tkacs@...>
>
>
> So you'd be directly controlling the waveshape? That could be
> interesting; I
> don't think you'd get direct control over the partials that way
> but it could
> probably make some cool new waveforms.
>
>
>
>  -----Original Message-----
> From: 	davevosh@... [mailto:davevosh@...]
> Sent:	Wednesday, 22 March, 2000 11:12 PM
> To:	motm@onelist.com
> Subject:	Re: [motm] Partially Mad
>
>
>
> going from this back to the "simpler" ( ? ) idea of using a sequencer :
> ( as i recall, you were familiar with serge stuff like the "tkb" and for
> whatever reason, i can visualize this easier in terms of that unit )
> clock it at a superaudio rate so when divided down, you are in the audio
> range. then, instead of using the row voltage output, take the
> gate output (
>
> there`s one for each of the 16 stages ), think of the gate as
> being a fixed
> 5
> volt steady state. feed each gate into a vca tuned to function best with
> control voltages. now, modulate those vca`s in various ways, envelopes or
> audio rate, whatever.  sum those modulated outputs in another mixer / vca
> type module. i would think that the varying level of each stage, when
> clocked
> at the audio rate to use the sequencer as a "vco" would produce a complex
> dynamic spectrum.  or am i crazy ( not to be ruled out ! ) ????
>
>
>
>
>
> ------------------------------------------------------------------------
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> ------------------------------------------------------------------------
>
>

In a message dated 00-03-23 08:56:25 EST, you write:

<< don't think you'd get direct control over the partials that way but it 
could
 probably make some cool new waveforms. >>


ken,
no, no direct control of partials but if you considered all 16 stages as 
"positive pulses", then used less than all 16 with eccentric shaping you`d 
get an odd waveshape when clocked at high speed. then, take the stages that 
were being used and simultaneously modulate their amplitude at an audio rate 
( or whatever ) and you`d get a different sort of dynamic spectrum.
best,
dave v.

In a message dated 00-03-23 10:31:45 EST, you write:

<< 
 JH's interpolating scanner is more suited to this than a sequencer. It
 already has the VCAs built in to crossfade from one input to another when
 swept by a CV. Also, it has built in normalized DC inputs to the VCAs so
 that you can directly synthesize waveforms with arbitrary breakpoints.
 
 http://www.synthfool.com/diy/jh_ipscan.html
  >>


dave,
thanks for the info...... i`ll have to take a look. i do recall some 
discussion of the device on the list months ago.  i was trying to visualize 
something in terms of stuff i was familiar with.
best,
dave v.