MOTM

Super curvy sawtooths, ocean waves, S-shape sawtooths, notched sines, 
stepped, heart shaped, etc.  There seems to be no limit to precision VCO 
waveform reshaping.  Picture below.

http://members.aol.com/elhardt/newwaves.jpg

-Elhardt

What was input and processing module? I am confused (happens a lot).

Paul S.

----- Original Message ----- 

From: <elhardt@...>
To: <motm@yahoogroups.com>
Sent: Wednesday, May 22, 2002 3:27 PM
Subject: [motm] Hundreds of new waveforms from VCO


> Super curvy sawtooths, ocean waves, S-shape sawtooths, notched sines, 
> stepped, heart shaped, etc.  There seems to be no limit to precision VCO 
> waveform reshaping.  Picture below.
> 
> http://members.aol.com/elhardt/newwaves.jpg
> 
> -Elhardt
> 
> 
>  
> 
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/ 
> 
>

Looks like someone's wavetable osc.

> -----Original Message-----
> From: Paul Schreiber [mailto:synth1@...]
> Sent: Wednesday, May 22, 2002 1:37 PM
> To: motm@yahoogroups.com; elhardt@...
> Subject: Re: [motm] Hundreds of new waveforms from VCO
>
>
> What was input and processing module? I am confused (happens a lot).
>
> Paul S.
>
> ----- Original Message -----
> From: <elhardt@...>
> To: <motm@yahoogroups.com>
> Sent: Wednesday, May 22, 2002 3:27 PM
> Subject: [motm] Hundreds of new waveforms from VCO
>
>
> > Super curvy sawtooths, ocean waves, S-shape sawtooths, notched sines,
> > stepped, heart shaped, etc.  There seems to be no limit to
> precision VCO
> > waveform reshaping.  Picture below.
> >
> > http://members.aol.com/elhardt/newwaves.jpg
> >
> > -Elhardt
> >
> >
> >
> >
> > Your use of Yahoo! Groups is subject to
> http://docs.yahoo.com/info/terms/
> >
> >
>
>
>
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>

> Super curvy sawtooths, ocean waves, S-shape sawtooths, notched sines,
> stepped, heart shaped, etc.  There seems to be no limit to precision VCO
> waveform reshaping.  Picture below.

it would be really awesome if you put samples up there of what these sound
like... esp. that notched sine and the discontinuous thingy beneath it!

(oh... *and* what modules you made 'em with.)

bleep.
out.

---
www.mp3.com/leichenfeld
www.mp3.com/captainhotrod
www.mp3.com/silenttristero

>>How'd you do dat?<<

I was hoping somebody would guess.  Actually it's quite simple.  Just one 
VCO, one VCA and two cables.  Use one waveform for the audio input and 
another for modulation input.  It can even be the same waveform.  For example 
if you want a curved sawtooth, just modulate a sawtooth with itself.  The 
Bias knob is good for chopping waves down or adding flat parts.

>>it would be really awesome if you put samples up there of what these sound
like... esp. that notched sine and the discontinuous thingy beneath it!<<

You can patch them up to hear them.  Like most static waveforms, they aren't 
all that interesting in themselves, althought the bottom right one gives a 
pretty semi-oboe semi-Carlos type sound when used in a patch.  If you don't 
want the obvious sounds of the built-in VCO waves, it can give you something 
a little different.  It turns out that sometimes looks can be deceiving 
though.  For instance it's also possible to get a notched sine by just mixing 
an inverted pulsewave with a sine.

However, using this technique I'm able to get something similar to pulsewave 
modulation.  But instead of a nasal sounding pulse sweeping to a hollow 
square, a nasal sounding wave can be swepth to a sawtooth sounding wave.  
Possible string/brass applications.

In the picture below, to get a little more complex I added a mixer inbetween 
the VCO and VCA.  I used two waves to modulate a third and was able to use 
the inverting capability of the mixer.  Doing that I was able to get what 
looks like a wave that alternates between full cycles of a square and a small 
sine wave.  The bottom waveform is nothing more than an inverted tri added to 
a sine with a mixer.

http://members.aol.com/elhardt/morewaves.jpg

-Elhardt

> ----- Original Message -----
> From: <elhardt@...>
> I was hoping somebody would guess.  Actually it's
> quite simple.  Just one  VCO, one VCA and two
> cables.  Use one waveform for the audio input and
> another for modulation input.

I love this list.  I am so modular stupid and stuck inside a paradigm, I
would have never considered such an approach.  I would love to see a lot
more feedback from others on "non-traditional" patching.  I get stuck in
patching ruts and severly need help thinking in modular terms.  My lack of
experience with past modular is showing.. :)
Thanks Ken
Larry

At 9:50 PM -0400 2002/05/22, elhardt@... wrote:
>  >>How'd you do dat?<<
>
>I was hoping somebody would guess.  Actually it's quite simple.  Just one
>VCO, one VCA and two cables.  Use one waveform for the audio input and
>another for modulation input.  It can even be the same waveform.  For example
>if you want a curved sawtooth, just modulate a sawtooth with itself.  The
>Bias knob is good for chopping waves down or adding flat parts.

A VCA, of course, those things are so useful. I can't wait to get more.

In a similar vein, you can "exponentiate" oscillator waveforms by 
feeding an output into it's own exponential input. A good example is 
to feed the triangle output back into FM2. Watch the shape of the 
triangle output on a scope as you twist the FM2 knob. Works well with 
saws and sines as well. Now imagine how much fun you can have if the 
signal driving the FM2 input goes through a VCA: more voltage 
controlled waveforms.

jlarryh@... writes:

>>I would love to see a lot more feedback from others on "non-traditional" 
patching.<<

That's the problem with a lot of these lists, there isn't enough talk about 
synth techniques.  I remember once somebody asked if there was a way on the 
MOTM to feed in a waveform a get a pitch an octave higher (it's easy to 
divide a wave down an octave or more), and somebody mentioned a ring 
modulator could do it.  I slapped my head and thought of course, why didn't I 
think of that.  Sometimes it's the simple things that are easily overlooked.

-Elhardt

Your could mathematically describe your VCA method
as VCO_waveform1 x HWR(VCO_waveform2)
where HWR means half wave rectifying.
In other words, it's similar to RM (ringmod), but with the
negative half of one RM input signal clipped.
(VCA ignores negative CV).
If you want to make an analytical description of the resulting
spectrum, this should be possible: Harmonics of waveform1
(as usual), and harmonics of clipped waveform2 (still
possible with textbook methods), and then get the f1+f2 and f1-f2
of each combination of harmonics.
With one signal being a sine wave (the one that goes to the VCA's
signal input), it's quite easy to calculate.

JH.


-----Urspr\ufffdngliche Nachricht-----
Von: <elhardt@...>
An: <motm@yahoogroups.com>
Gesendet: Donnerstag, 23. Mai 2002 23:31
Betreff: Re: [motm] Hundreds of new waveforms from VCO


> jlarryh@... writes:
>
> >>I would love to see a lot more feedback from others on "non-traditional"
> patching.<<
>
> That's the problem with a lot of these lists, there isn't enough talk
about
> synth techniques.  I remember once somebody asked if there was a way on
the
> MOTM to feed in a waveform a get a pitch an octave higher (it's easy to
> divide a wave down an octave or more), and somebody mentioned a ring
> modulator could do it.  I slapped my head and thought of course, why
didn't I
> think of that.  Sometimes it's the simple things that are easily
overlooked.

>
> -Elhardt
>
>
>
>
>
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>

At 10:15 PM -0600 2002/05/22, Scott Juskiw wrote:
>In a similar vein, you can "exponentiate" oscillator waveforms by
>feeding an output into it's own exponential input. A good example is
>to feed the triangle output back into FM2. Watch the shape of the
>triangle output on a scope as you twist the FM2 knob. Works well with
>saws and sines as well. Now imagine how much fun you can have if the
>signal driving the FM2 input goes through a VCA: more voltage
>controlled waveforms.

Oops, I forgot that the oscillator pitch also changes as you turn the 
FM knob to exponentiate the waveform. So it's not very useful for 
dynamic waveform modulation when you want to maintain a pitch. Sorry 
about that. Thanks to geblinkoort for pointing this out.

Although, if you use the FM1 input with AC coupling then you can sort 
of maintain the pitch. It will wiggle about as the FM1 knob changes 
but the cap will block the DC offset and the pitch will return to 
almost normal. I'm not sure if this is useful or not.

Two books that helped me "break out of the rut" are Alan Strange's book
"Electronic Music" and Roland's "The Synthesizer" 4-book set.  Now I know
enough to realize how much I still have to learn. :)

George

----- Original Message -----

From: J. Larry Hendry <jlarryh@...>
To: MOTM List <motm@yahoogroups.com>
Sent: Wednesday, May 22, 2002 10:37 PM
Subject: Re: [motm] Hundreds of new waveforms from VCO


> > ----- Original Message -----
> > From: <elhardt@...>
> > I was hoping somebody would guess.  Actually it's
> > quite simple.  Just one  VCO, one VCA and two
> > cables.  Use one waveform for the audio input and
> > another for modulation input.
>
> I love this list.  I am so modular stupid and stuck inside a paradigm, I
> would have never considered such an approach.  I would love to see a lot
> more feedback from others on "non-traditional" patching.  I get stuck in
> patching ruts and severly need help thinking in modular terms.  My lack of
> experience with past modular is showing.. :)
> Thanks Ken
> Larry