MOTM

That often gets called a "skew" control. I've often seen things like it on
LFOs (i.e., the Korg MS 'Modulation Generators'), but to my knowledge not on
an *audio* oscillator (Serge may have something that does this, I don't
remember).

I could be wrong, but I thought there was talk of a "shape" control
something like this for the upcoming MOTM 1u VCO...?

I don't have my MOTM-320 VCLFO yet---is this what happens to the Triangle
output when you sweep it's Shape control? 

 -----Original Message-----
From: 	Brousseau, Paul E (Paul) [mailto:noise@...] 
Sent:	Monday, 20 March, 2000 3:20 PM
To:	'motm@onelist.com'
Subject:	[motm] VCO concept...



I don't recall where I first heard about this idea / feature, but it sounds
really neat, and like the kind of thing that would be on a MOTM module.
There is a function I've seen that's sort of a PWM for triangle waveforms.
It sweeps the shape from sawtooth to triangle to reverse sawtooth smoothly.

Forgive the poor ASCII art, but this is the idea:
|\           |\             /\             /|           /|
|  \   -->  |   \   -->   /    \   -->   /   |  -->   /  |
|    \     |      \     /        \     /      |     /    |


Any chance of seeing that on a future VCO?  Is this technically feasable?
Or am I daft and its already around?
* PBr

(BTW, Hi, this is still Paul Brousseau.  Apparently my workplace decided
unannounced that outgoing e-mail is going to be from our lucent accounts
instead of the old mosaix account.  So this is still me.  Hi.)

I don't recall where I first heard about this idea / feature, but it sounds
really neat, and like the kind of thing that would be on a MOTM module.
There is a function I've seen that's sort of a PWM for triangle waveforms.
It sweeps the shape from sawtooth to triangle to reverse sawtooth smoothly.


Forgive the poor ASCII art, but this is the idea:

|\           |\             /\             /|           /|
|  \   -->  |   \   -->   /    \   -->   /   |  -->   /  |
|    \     |      \     /        \     /      |     /    |


Any chance of seeing that on a future VCO?  Is this technically feasable?
Or am I daft and its already around?

--PBr

It's already a feature on the 320 LFO, and something similair is in the
works for the upcoming 310 micro VCO.

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

> From: "Brousseau, Paul E (Paul)" <noise@...>
>
> (BTW, Hi, this is still Paul Brousseau.  Apparently my workplace decided
> unannounced that outgoing e-mail is going to be from our lucent accounts
> instead of the old mosaix account.  So this is still me.  Hi.)
>
> I don't recall where I first heard about this idea / feature, but
> it sounds
> really neat, and like the kind of thing that would be on a MOTM module.
> There is a function I've seen that's sort of a PWM for triangle waveforms.
> It sweeps the shape from sawtooth to triangle to reverse sawtooth
> smoothly.
>
>
> Forgive the poor ASCII art, but this is the idea:
>
> |\           |\             /\             /|           /|
> |  \   -->  |   \   -->   /    \   -->   /   |  -->   /  |
> |    \     |      \     /        \     /      |     /    |
>
>
> Any chance of seeing that on a future VCO?  Is this technically feasable?
> Or am I daft and its already around?
>
> --PBr

>
> That often gets called a "skew" control. I've often seen things like it on
> LFOs (i.e., the Korg MS 'Modulation Generators'), but to my knowledge not
on
> an *audio* oscillator (Serge may have something that does this, I don't
> remember).
My micromoog (& I'm sure many other Moogs) has continously variable
waveshape.  Waveshape can also be set as a modulation destination.


>  I don't have my MOTM-320 VCLFO yet---is this what happens to the Triangle
> output when you sweep it's Shape control?
>
I am pretty sure the triangle is the one waveform w/o waveshaping on the
320.  (someone
will undoubtedly correct me if I'm wrong.)  The shape control is great,
though, & pushing the 320 into audio range is highly recommended(by me,
anyway)

tomr
>
>
>  -----Original Message-----
> From: Brousseau, Paul E (Paul) [mailto:noise@...]
> Sent: Monday, 20 March, 2000 3:20 PM
> To: 'motm@onelist.com'
> Subject: [motm] VCO concept...
>
>
>
> I don't recall where I first heard about this idea / feature, but it
sounds
> really neat, and like the kind of thing that would be on a MOTM module.
> There is a function I've seen that's sort of a PWM for triangle waveforms.
> It sweeps the shape from sawtooth to triangle to reverse sawtooth
smoothly.

>
> Forgive the poor ASCII art, but this is the idea:
> |\           |\             /\             /|           /|
> |  \   -->  |   \   -->   /    \   -->   /   |  -->   /  |
> |    \     |      \     /        \     /      |     /    |
>
>
> Any chance of seeing that on a future VCO?  Is this technically feasable?
> Or am I daft and its already around?
> * PBr
>
>
>
>
> ------------------------------------------------------------------------
> PERFORM CPR ON YOUR APR!
> Get a NextCard Visa, in 30 seconds!  Get rates as low as
> 0.0% Intro or 9.9% Fixed APR and no hidden fees.
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> http://click.egroups.com/1/2121/3/_/529958/_/953583850/
> ------------------------------------------------------------------------
>
>

Oh, okay-so the Triangle is fixed, but in essence the Sawtooth output is
really doing what would be done if you skewed the Triangle anyway.

 -----Original Message-----
From: 	Dave Bradley [mailto:daveb@...] 
Sent:	Monday, 20 March, 2000 4:28 PM
To:	motm@onelist.com
Subject:	RE: [motm] VCO concept...



Triangle output stays fixed, but Sine, Saw, and Pulse outputs are affected.
See for details:

http://www.synthtech.com/demo/shapes.gif

This shows a sawtooth morphing through a double freq triangle to a reverse
sawtooth. Get yer 320s if you haven't already, folks - this is very cool!

> From: "Tkacs, Ken" <ken.tkacs@...>
>
> I could be wrong, but I thought there was talk of a "shape" control
> something like this for the upcoming MOTM 1u VCO...?
>

For those who joined the list after the big "micro VCO" discussion, attached
is an image depicting where we ended up. Single space, relatively
inexpensive, fixed triangle and manually variable (from square to saw)
outputs.

> I don't have my MOTM-320 VCLFO yet---is this what happens to the Triangle
> output when you sweep it's Shape control?
>

Triangle output stays fixed, but Sine, Saw, and Pulse outputs are affected.
See for details:

http://www.synthtech.com/demo/shapes.gif

This shows a sawtooth morphing through a double freq triangle to a reverse
sawtooth. Get yer 320s if you haven't already, folks - this is very cool!

Dave

> I am pretty sure the triangle is the one waveform w/o waveshaping on the
> 320.  (someone
> will undoubtedly correct me if I'm wrong.)  The shape control is great,
> though, & pushing the 320 into audio range is highly recommended(by me,
> anyway)
>
> tomr

I agree completely! I've used it in audio range in a couple of tracks
already.

Also the pulse output makes a cool gate, synced via a trigger!

> From: "Tkacs, Ken" <ken.tkacs@...>
> 
> Oh, okay-so the Triangle is fixed, but in essence the Sawtooth output is
> really doing what would be done if you skewed the Triangle anyway.

You got it Ken.  The 320 is one of my favorite modules.  

And, I would like to echo the comments concerning using the 320 in the
audio range.  It bakes a much better sounding smooth sub-osc than the 120
square waves out.  Just use the 120 to sync it up, since the 1 v/oct scale
is close but not designed to be exact (per Paul).

Larry H

Don't forget using a self-oscillating 420 (and the forthcoming 440) as a
sub-oscillator. The 420 tracks very well (though I haven't tried it over a
wide range). The sine puts an unobtrusive bed in there; if you want to give
it more presence, send it through the 120.

David.

> -----Original Message-----
> From: J. Larry Hendry [mailto:jlarryh@...]
> Sent: Monday, March 20, 2000 5:24 PM
> To: motm@onelist.com
> Subject: Re: [motm] VCO concept...
>
>
> From: "J. Larry Hendry" <jlarryh@...>
>
> > From: "Tkacs, Ken" <ken.tkacs@...>
> >
> > Oh, okay-so the Triangle is fixed, but in essence the Sawtooth output is
> > really doing what would be done if you skewed the Triangle anyway.
>
> You got it Ken.  The 320 is one of my favorite modules.
>
> And, I would like to echo the comments concerning using the 320 in the
> audio range.  It bakes a much better sounding smooth sub-osc than the 120
> square waves out.  Just use the 120 to sync it up, since the 1 v/oct scale
> is close but not designed to be exact (per Paul).
>
> Larry H
>
> ------------------------------------------------------------------------
> GET A NEXTCARD VISA, in 30 seconds!  Get rates as low as 2.9%
> Intro or 9.9% Fixed APR and no hidden fees.  Apply NOW!
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>
>

In a message dated 00-03-20 15:20:54 EST, you write:

<<  Is this technically feasable? >>



paul,
there has been a "symmetric ramp modulation" ( ie : sawtooth "pwm" type of 
thing ) designed before, i`ve seen it in an "electronotes" vco design. maybe 
paul could look at this for a revision of the motm vco module - ?
best,
dave v.