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Linear FM constant freq or not for constant timbre?

Linear FM constant freq or not for constant timbre?

2006-03-19 by mate_stubb

I remember a discussion awhile back where it was stated that the
modulator doesn't need to be tracking the keyboard in parallel with
the ZO being modulated. I thought the reason given was that the lin fm
component was added into the total cv separately. Or something like that.

Anyway,

My by the ear experiments seem to say otherwise - when I want a
constant timbre that tracks the keyboard, I end up modulating both
vcos with the kbd voltage.

Did I misunderstand the original post?

Moe
http://www.stoogeindustries.com

Re: [The_Cyndustries_List] Linear FM constant freq or not for constant timbre?

2006-03-19 by Cynthia Webster

mate_stubb wrote:

> I remember a discussion awhile back where it was stated that the
> modulator doesn't need to be tracking the keyboard in parallel with
> the ZO being modulated. I thought the reason given was that the lin fm
> component was added into the total cv separately. Or something like that.
>
> Anyway,
>
> My by the ear experiments seem to say otherwise - when I want a
> constant timbre that tracks the keyboard, I end up modulating both
> vcos with the kbd voltage.
>
> Did I misunderstand the original post?


Yup!  A keyboard, sequencer, or quantizer should be plugged
into the 1v/octave inputs of both modulator & carrier oscillators,
(in this case the ZO & MOTM 300).

If you modulate your modulators as in Compound FM Synthesis
then the second (and subsequent) modulators should also be
tracking along with the same one-volt-to-the-octave ("1/Moog")
source.

(remember, the above is only the "official" method, have fun!)

Cyn
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width of dot com ZO?

2006-03-19 by atonal

Can anybody tell me how wide the dot com ZO is going to be? I'm sure that this information is 
posted somewhere, but I haven't been able to find it.

-george

Re: Linear FM constant freq or not for constant timbre?

2006-03-20 by tuninghead

Hey Moe,

Cynthia's reply to you is correct.  Carrier and modulator freqs must
track.  It took a little looking, but I found the paragraph I posted
that was the source of your confusion:

============
To sum it all up (no pun), LinCV does not have a constant shifting
effect.  The amount LinCV will move F is dependent on ExpCV.  Also,
because the relationship is multiplicative and not additive, we do not
need to scale our LinCVs with frequency to achieve constant timbre up
and down the keyboard as classical FM would dictate.
============

What I meant by "scale" was the AMPLITUDE of the modulator as the freq
is moved. -- and I should have said PM like in the DX-7.  In PM, it is
effectively the first derivative of the modulator that is used.  This
results in a rolloff of low freqs (it's like a -6db/oct filter) and as
you move notes, you have to compensate for this.  The ZO always runs
everything ratiometrically, so no worries.

Clear as ever, I hope.

--Mark Barton





--- In The_Cyndustries_List@yahoogroups.com, "mate_stubb"
<mate_stubb@...> wrote:
>
> I remember a discussion awhile back where it was stated that the
> modulator doesn't need to be tracking the keyboard in parallel with
> the ZO being modulated. I thought the reason given was that the lin fm
> component was added into the total cv separately. Or something like
that.
Show quoted textHide quoted text
> 
> Anyway,
> 
> My by the ear experiments seem to say otherwise - when I want a
> constant timbre that tracks the keyboard, I end up modulating both
> vcos with the kbd voltage.
> 
> Did I misunderstand the original post?
> 
> Moe
> http://www.stoogeindustries.com
>

Re: Linear FM constant freq or not for constant timbre?

2006-03-20 by mate_stubb

Thanks for the replies. So if I understand correctly, in DX style
synthesis they have to compensate for amplitude of the modulators as
the keyboard tracks? I'm glad we don't have that problem!

Moe
http://www.stoogeindustries.com

--- In The_Cyndustries_List@yahoogroups.com, "tuninghead"
<thruzero@...> wrote:
Show quoted textHide quoted text
>
> 
> Hey Moe,
> 
> Cynthia's reply to you is correct.  Carrier and modulator freqs must
> track.  It took a little looking, but I found the paragraph I posted
> that was the source of your confusion:
> 
> ============
> To sum it all up (no pun), LinCV does not have a constant shifting
> effect.  The amount LinCV will move F is dependent on ExpCV.  Also,
> because the relationship is multiplicative and not additive, we do not
> need to scale our LinCVs with frequency to achieve constant timbre up
> and down the keyboard as classical FM would dictate.
> ============
> 
> What I meant by "scale" was the AMPLITUDE of the modulator as the freq
> is moved. -- and I should have said PM like in the DX-7.  In PM, it is
> effectively the first derivative of the modulator that is used.  This
> results in a rolloff of low freqs (it's like a -6db/oct filter) and as
> you move notes, you have to compensate for this.  The ZO always runs
> everything ratiometrically, so no worries.
> 
> Clear as ever, I hope.
> 
> --Mark Barton
> 
> 
> 
> 
> 
> --- In The_Cyndustries_List@yahoogroups.com, "mate_stubb"
> <mate_stubb@> wrote:
> >
> > I remember a discussion awhile back where it was stated that the
> > modulator doesn't need to be tracking the keyboard in parallel with
> > the ZO being modulated. I thought the reason given was that the lin fm
> > component was added into the total cv separately. Or something like
> that.
> > 
> > Anyway,
> > 
> > My by the ear experiments seem to say otherwise - when I want a
> > constant timbre that tracks the keyboard, I end up modulating both
> > vcos with the kbd voltage.
> > 
> > Did I misunderstand the original post?
> > 
> > Moe
> > http://www.stoogeindustries.com
> >
>

Re: width of dot com ZO?

2006-03-20 by Carlos

3 single .com modules wide. 

C

--- In The_Cyndustries_List@yahoogroups.com, "atonal" <atonal@...> wrote:
>
> Can anybody tell me how wide the dot com ZO is going to be? I'm sure
that this information is
Show quoted textHide quoted text
> posted somewhere, but I haven't been able to find it.
> 
> -george
>

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