[sdiy] Polyphonic Vibrato

[harry]

Okay...

Now I'll tell what I'm doing.  As Dave Krooshof correctly noted... my
application is for a Guitar synth application.  I don't have ANY VCO's
at all... all the sounds are processed strings, that go to VCF, VCA etc.

Doing vibrato is a matter of using a modulated all-pass filter line... right

now its a monophonic 6 stage phaser (without summing amp at the output)
driven by its own LFO.

If I want to do polyphonic vibrato.. it will cost a lot of money (no
problem... I
don't play golf) and real estate (the box is crowded NOW...).  So I figured
I'd
ask for some opinions as to whether its worth the effort. Thanks to all who
responded.

For those familiar with guitar effects... the unit is capable of making most
sounds
from a Big Muff II fuzz and a Mutron III envelope follower.  The controls
are much
more advanced... but in use it is like a nice string sound behind the
guitar. It can
get radical if you LIKE but usually its a mellow sound.

Alas... I did not include the ability to do actual triggered envelopes (it
has lag and
attack delay only)... or any frequency modulation effects... such as
tremolo, vibrato,
or filter mod.  I thought I would not miss them. Maybe I thought wrong (otoh
I still
don't think they are super useful for me).

I will probably just add a single vibrato section to this unit... THEN plan
a card
per voice unit with ALL the bells and whistles.

I'm having a lot of fun... its like the Guitar Synth I always wanted...
without the
30mS delay and all the wrong notes...

Thanks again everyone....

H^) harry

"Oren B. Leavitt" wrote:

> Hello Harry & List,
>
> I think it is a wonderful way to get that true ensemble effect that you
> just can't get using post process effects such as chorusing, etc.
> In a mono or duo phonic setup, I like using three oscillators per voice,
> tuned to unison, with a separate LFO applying vibrato to each
> oscillator. This produces a delicious ensemble effect.
> For chords on a poly, a separate LFO on each voice applying a very small
> amount of vibrato would be a neat effect. Add more vibrato, and it will
> definitely sound unORGANized ;-)
> Lots of possibilities here!
>
> harry wrote:
>
> > Opinions solicited....
> >
> > How useful is it to have polyphonic vibrato (i.e. one LFO per
> > voice) in a polysynth.  This polysynth will play cloce voiced
> > chords, as a rule....
> >
> > I wonder if having many LFOs would actually make the sound
> > out-of-tune as they phase in and out.
> >
> > I might do polyphonic LFO depth from a single LFO (delayed vibrato
> > per voice)
> >
> > opinions ? I KNOW everyone HAS one....  ;^P
> >
> > H^) harry
>
> --
> Oren Leavitt
> oleavitt at ix.netcom.com

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