MOTM

IMO, the uLFO should not be a scaled down version
of the big one, but something to complement it.

So here's a completely different idea:

What about an "Animation LFO" ?
To breathe life into static patches, you need a lot of
subtle modulation rather than the most exciting of
waveshapes.

In the JH-3, I have a module that consists of five 
triangle-only LFOs (independend frequency control).
And it has an extra output where all LFOs are
added which are not used on their individual outputs.

The idea behind this was to have either
(1) a bank of simple, independent LFOs to modulate
various destinations sat different rates, or
(2) to have a "pseudo random" waveform from adding
several LFO outputs. This is very useful as a 
non-periodic modulation source that doesn't 
make unexpected "jumps" like filtered random signals.
(3) A mix of both.

Translated to MOTM, this could be:

4 triangle LFOs in one module.
4 Pots for Frequency of each LFO
4 Output jacks with a clever assignment:

Outputs 1 ... 3 carry LFO outputs 1 ...3.
Output 4 carries the weighted sum of all otherwise
unused LFOs, including LFO 4.

This means:

If all jacks are used, you have 4 independent LFOs.

If you only plug in output 4, you have 
(LFO1+LFO2+LFO3+LFO4)/4 at output 4. (This is is much better
fluctuating voltage source than Buchla's infamous
Source Of Uncertainty, IMHO)

If you plug in output 1 and 4, you have LFO 1 at output 1
(of course), and still (LFO2+LFO3+LFO4)/3 at output 4.

If you plug in output 2, 3 and 4, you have 
LFO2 at output 2, LFO3 at output 3, and
(LFO1+LFO4)/2 at output 4

Complicated? No. Each unused output is simply propagated
to Output 4, and the volatge swing there is constant at +/-5V.

If you have tried this once, you never want to miss it again.
You can even do some crude "Fourier Shaping" of the waveform
at output 4 when you set integer ratios for the LFO Rates.
(Integer ratios will only be approximated -> animated
waveforms ... No integer ratios: Pseudo random ...)

JH.

OK, Jurgen wins.

--- In motm@y..., jhaible@t... wrote:

> IMO, the uLFO should not be a scaled down version
> of the big one, but something to complement it.
> 
> So here's a completely different idea:
> 
> What about an "Animation LFO" ?
> To breathe life into static patches, you need a lot of
> subtle modulation rather than the most exciting of
> waveshapes.
> 
> In the JH-3, I have a module that consists of five 
> triangle-only LFOs (independend frequency control).
> And it has an extra output where all LFOs are
> added which are not used on their individual outputs.
> 
> The idea behind this was to have either
> (1) a bank of simple, independent LFOs to modulate
> various destinations sat different rates, or
> (2) to have a "pseudo random" waveform from adding
> several LFO outputs. This is very useful as a 
> non-periodic modulation source that doesn't 
> make unexpected "jumps" like filtered random signals.
> (3) A mix of both.
> 
> Translated to MOTM, this could be:
> 
> 4 triangle LFOs in one module.
> 4 Pots for Frequency of each LFO
> 4 Output jacks with a clever assignment:
> 
> Outputs 1 ... 3 carry LFO outputs 1 ...3.
> Output 4 carries the weighted sum of all otherwise
> unused LFOs, including LFO 4.
> 
> This means:
> 
> If all jacks are used, you have 4 independent LFOs.
> 
> If you only plug in output 4, you have 
> (LFO1+LFO2+LFO3+LFO4)/4 at output 4. (This is is much better
> fluctuating voltage source than Buchla's infamous
> Source Of Uncertainty, IMHO)
> 
> If you plug in output 1 and 4, you have LFO 1 at output 1
> (of course), and still (LFO2+LFO3+LFO4)/3 at output 4.
> 
> If you plug in output 2, 3 and 4, you have 
> LFO2 at output 2, LFO3 at output 3, and
> (LFO1+LFO4)/2 at output 4
> 
> Complicated? No. Each unused output is simply propagated
> to Output 4, and the volatge swing there is constant at +/-5V.
> 
> If you have tried this once, you never want to miss it again.
> You can even do some crude "Fourier Shaping" of the waveform
> at output 4 when you set integer ratios for the LFO Rates.
> (Integer ratios will only be approximated -> animated
> waveforms ... No integer ratios: Pseudo random ...)
> 
> JH.

> 
> So here's a completely different idea:
> 
> What about an "Animation LFO" ?
>

Shhhh....this is *another* module idea :) or 2, even.

I need "utilitarian", "cheap". I also need "strange", but not for this homework assignment.

Paul S.

Of course this opens the door for the uComparator module - 4 comparators in
one 1U module, so if you want a square wave version of this lfo... you can
have that too.  Ken Stone sells a PCB for a pseudo-random square wave LFO
that's made of several square lfos that are summed together, which is why I
thought of this.  Very nice module, BTW.
 
R.

-----Original Message-----
From: jhaible@... [mailto:jhaible@...]
Sent: Wednesday, December 05, 2001 10:16 AM
To: motm@yahoogroups.com
Subject: [motm] Animation LFO (was: Mock up the MOTM-390 uLFO)


IMO, the uLFO should not be a scaled down version
of the big one, but something to complement it.

So here's a completely different idea:

What about an "Animation LFO" ?
To breathe life into static patches, you need a lot of
subtle modulation rather than the most exciting of
waveshapes.

In the JH-3, I have a module that consists of five 
triangle-only LFOs (independend frequency control).
And it has an extra output where all LFOs are
added which are not used on their individual outputs.

The idea behind this was to have either
(1) a bank of simple, independent LFOs to modulate
various destinations sat different rates, or
(2) to have a "pseudo random" waveform from adding
several LFO outputs. This is very useful as a 
non-periodic modulation source that doesn't 
make unexpected "jumps" like filtered random signals.
(3) A mix of both.

Translated to MOTM, this could be:

4 triangle LFOs in one module.
4 Pots for Frequency of each LFO
4 Output jacks with a clever assignment:

Outputs 1 ... 3 carry LFO outputs 1 ...3.
Output 4 carries the weighted sum of all otherwise
unused LFOs, including LFO 4.

This means:

If all jacks are used, you have 4 independent LFOs.

If you only plug in output 4, you have 
(LFO1+LFO2+LFO3+LFO4)/4 at output 4. (This is is much better
fluctuating voltage source than Buchla's infamous
Source Of Uncertainty, IMHO)

If you plug in output 1 and 4, you have LFO 1 at output 1
(of course), and still (LFO2+LFO3+LFO4)/3 at output 4.

If you plug in output 2, 3 and 4, you have 
LFO2 at output 2, LFO3 at output 3, and
(LFO1+LFO4)/2 at output 4

Complicated? No. Each unused output is simply propagated
to Output 4, and the volatge swing there is constant at +/-5V.

If you have tried this once, you never want to miss it again.
You can even do some crude "Fourier Shaping" of the waveform
at output 4 when you set integer ratios for the LFO Rates.
(Integer ratios will only be approximated -> animated
waveforms ... No integer ratios: Pseudo random ...)

JH.


 

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

I agree, Jurgen's idea is brilliant.

Moe

>>>> 
OK, Jurgen wins.

--- In motm@y..., jhaible@t... wrote:
> IMO, the uLFO should not be a scaled down version
> of the big one, but something to complement it.
> 
> So here's a completely different idea:
> 
> What about an "Animation LFO" ?
> To breathe life into static patches, you need a lot of
> subtle modulation rather than the most exciting of
> waveshapes.
<<<<

At 7:15 PM +0100 12/05/01, jhaible@... wrote:
>
>IMO, the uLFO should not be a scaled down version
>of the big one, but something to complement it.

I couldn't possibly agree more.

>So here's a completely different idea:
>
>What about an "Animation LFO" ?
>To breathe life into static patches, you need a lot of
>subtle modulation rather than the most exciting of
>waveshapes.
>
>Translated to MOTM, this could be:
>
>4 triangle LFOs in one module.
>4 Pots for Frequency of each LFO
>4 Output jacks with a clever assignment:
>
>Outputs 1 ... 3 carry LFO outputs 1 ...3.
>Output 4 carries the weighted sum of all otherwise
>unused LFOs, including LFO 4.

JH, that is clever!!  I like this idea very much, but I'd rather have it
include VC control.  If it were 2U, and divided the output voltage of an
exponential converter by the four pots it would also make a useful audio
source.  You could also put four JH f/N circuits in the feedback path of
four 4046's to multiply the frequency of a core VCO, but that would take
more parts and might not work at low frequencies.

Is sdiy up and running??  I haven't recieved any mail.

At 1:25 PM -0600 12/05/01, Paul Schreiber wrote:
>
>I need "utilitarian", "cheap". I also need "strange", but not for
>this homework assignment.

OK :)  Then I'd like to submit my strange idea of an LFO as a
possible 500 module.  People say they want a VC EG and an "EMS trapezoid",
well, there you go :)

Jurgen, you rock! I want one!!

>  > So here's a completely different idea:
>>
>>  What about an "Animation LFO" ?
>>
>
>Shhhh....this is *another* module idea :) or 2, even.
>
>I need "utilitarian", "cheap". I also need "strange", but not for 
>this homework assignment.
>
>Paul S.

Hmmm, there's some animation modules in those old Electronotes 
stashed under the bed. I wonder if....

-- 
------------------------------------------------------------------------
Scott Juskiw 
scott@...