Doepfer

hi list,
i have created a patch(that you will be able to hear
in a few days on the modular-planet)using my A155
sequencer for modulating(with linear fm)one of myA111
vco.this a111 vco then modulates,via the saw
output,(again with linear fm)my other a111 vco.the
result is interesting but i came up with even more
interesting sounds when i changed manually in real
time the LINEAR FM knob on my second a111.so,i was
wondering ,can i simulate this realtime variation in
the linear fm modulation by using an A132 DUAL LOW
COST VCA patched between the modulator(my first a111)
and the carrier(the second a111)?all i need to do is
control the a132 with an a140 adsr,..right??
waiting for ideas...


=====
synthfreak(parallel worlds)
athens-greece
[Doepfer_a100] group owner-moderator

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Hi bakis 

> wondering ,can i simulate this realtime variation in
> the linear fm modulation by using an A132 DUAL LOW
> COST VCA patched between the modulator(my first a111)
> and the carrier(the second a111)?all i need to do is
> control the a132 with an a140 adsr,..right??
> waiting for ideas...
Of course you can do this. But why use a Envelope: much more interesting
should be the Sequencer to modulate this VCA. Alternatively you might use
the sequencer clock to trigger a S&H which is fed by a fast LFO. This
results in a renadom like, but nevertheless regular repeating sequence.

BTW: controlling the linear-FM Input with the Sequencer is not that
sense-making, since this input is DC decoupled. You will have a kind off
glide effect to and from the Sequencers tuning back to the standard tuning
of the VCO.

Florian
-- 
Florian Anwander                  |ConSol*  HP-Support
Tel.   +49.89.45841-133           |Consulting&Solutions Software GmbH
Fax    +49.89.45841-139           |Franziskanerstr. 38, D-81669 München
email: florian.anwander@consol.de |http://www.consol.de

hi florian,
...dc decoupled...????please explain...

--- Florian Anwander <Florian.Anwander@consol.de>
wrote:
> Hi bakis 
> 
> > wondering ,can i simulate this realtime variation
> in
> > the linear fm modulation by using an A132 DUAL LOW
> > COST VCA patched between the modulator(my first
> a111)
> > and the carrier(the second a111)?all i need to do
> is
> > control the a132 with an a140 adsr,..right??
> > waiting for ideas...
> Of course you can do this. But why use a Envelope:
> much more interesting
> should be the Sequencer to modulate this VCA.
> Alternatively you might use
> the sequencer clock to trigger a S&H which is fed by
> a fast LFO. This
> results in a renadom like, but nevertheless regular
> repeating sequence.
> 
> BTW: controlling the linear-FM Input with the
> Sequencer is not that
> sense-making, since this input is DC decoupled. You
> will have a kind off
> glide effect to and from the Sequencers tuning back
> to the standard tuning
> of the VCO.
> 
> Florian
> -- 
> Florian Anwander                  |ConSol* 
> HP-Support
> Tel.   +49.89.45841-133          
> |Consulting&Solutions Software GmbH
> Fax    +49.89.45841-139           |Franziskanerstr.
> 38, D-81669 M�nchen
> email: florian.anwander@consol.de
> |http://www.consol.de
> 


=====
synthfreak(parallel worlds)
athens-greece
[Doepfer_a100] group owner-moderator

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Hi bakis 

> ...dc decoupled...????please explain...

If you have the schematics of the VCO-110 you will find a capacitor inline
in the Linear FM Input. Something like that:

                    capacitor
                   /
Input jack o------||---+-----to linear mod In of CEM 3340
                       |
                       |
                       -
                      | |
                      | | <...Resistor
                      | |
                       -
                       |
                       |
                      Ground
                       


This capacitor will let through AC but will stop DC. This is necessary,
since a possible DC-offset of a modulation signal would detune the VCO
instead of adding only a fast vibrato. Your Sequencer sends out only DC...


Florian  
-- 
Florian Anwander                  |ConSol*  HP-Support
Tel.   +49.89.45841-133           |Consulting&Solutions Software GmbH
Fax    +49.89.45841-139           |Franziskanerstr. 38, D-81669 München
email: florian.anwander@consol.de |http://www.consol.de

hi,
thanks,but i think that when i connected the output of
the a155 to the lin.fm input of the a111 i heard
audible results(thought,they sounded like pitch
slides...)
as you explained ,the dc signals do not pass
thru,so,how did i hear these pitch slides?shouldn't i
hear nothing??
synthfreak

--- Florian Anwander <Florian.Anwander@consol.de>
wrote:
> Hi bakis 
> 
> > ...dc decoupled...????please explain...
> 
> If you have the schematics of the VCO-110 you will
> find a capacitor inline
> in the Linear FM Input. Something like that:
> 
>                     capacitor
>                    /
> Input jack o------||---+-----to linear mod In of CEM
> 3340
>                        |
>                        |
>                        -
>                       | |
>                       | | <...Resistor
>                       | |
>                        -
>                        |
>                        |
>                       Ground
>                        
> 
> 
> This capacitor will let through AC but will stop DC.
> This is necessary,
> since a possible DC-offset of a modulation signal
> would detune the VCO
> instead of adding only a fast vibrato. Your
> Sequencer sends out only DC...
> 
> 
> Florian  
> -- 
> Florian Anwander                  |ConSol* 
> HP-Support
> Tel.   +49.89.45841-133          
> |Consulting&Solutions Software GmbH
> Fax    +49.89.45841-139           |Franziskanerstr.
> 38, D-81669 M�nchen
> email: florian.anwander@consol.de
> |http://www.consol.de
> 


=====
synthfreak(parallel worlds)
athens-greece
[Doepfer_a100] group owner-moderator

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Hi bakis 

> thru,so,how did i hear these pitch slides?shouldn't i
> hear nothing??
Yes that is exactly what is to be expected: The Lin-FM input realizes a
change of the input voltage, so the pitch will change too; but then the
input voltage stays the same: it is a DC; this will be "removed", the pitch
of the VCO slides back to the original tuning.

BTW: I drew the schematic wrong. There should be a capacitor down to ground
and afterwards a resistor inline to the VCO CV-input

Florian
-- 
Florian Anwander                  |ConSol*  HP-Support
Tel.   +49.89.45841-133           |Consulting&Solutions Software GmbH
Fax    +49.89.45841-139           |Franziskanerstr. 38, D-81669 München
email: florian.anwander@consol.de |http://www.consol.de

thanks florian for sharing your knowledge...
synthfreak

--- Florian Anwander <Florian.Anwander@consol.de>
wrote:
> Hi bakis 
> 
> > thru,so,how did i hear these pitch
> slides?shouldn't i
> > hear nothing??
> Yes that is exactly what is to be expected: The
> Lin-FM input realizes a
> change of the input voltage, so the pitch will
> change too; but then the
> input voltage stays the same: it is a DC; this will
> be "removed", the pitch
> of the VCO slides back to the original tuning.
> 
> BTW: I drew the schematic wrong. There should be a
> capacitor down to ground
> and afterwards a resistor inline to the VCO CV-input
> 
> Florian
> -- 
> Florian Anwander                  |ConSol* 
> HP-Support
> Tel.   +49.89.45841-133          
> |Consulting&Solutions Software GmbH
> Fax    +49.89.45841-139           |Franziskanerstr.
> 38, D-81669 M�nchen
> email: florian.anwander@consol.de
> |http://www.consol.de
> 


=====
synthfreak(parallel worlds)
athens-greece
[Doepfer_a100] group owner-moderator

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