Doepfer

hello,
the problem thast mark describes is that he hears a
bit of FM when listening to other wevforms of the a111
while an lfo modulates the PW of the PWM input.
i suspect maybe the cem3340 is defective...?
is that a new a111 module?
best regards,     :-)
Bakis.



--- Florian Anwander <Florian.Anwander@consol.de>
wrote:

> hi Markus
> 
> > Hi, I'm new to the group and have set my A100 to
> operation for the first 
> > time a few days ago. I have one question
> concerning the high end 
> > VCO A-111. When I modulate the PCV-Input with an
> LFO and turn the 
> > PCV knob clockwise, there is also a weak FM in all
> signal outputs, 
> > bad enough not to use PWM.
> Pay attention: the faster the PWM, the more it will
> sound like pitch 
> modulation. For our ear a width modulated pulsewave
> is not one up and 
> one down movement but two peaks, where one is
> frequency modulated[*]. If 
> the FM seems to get weaker with slower LFO
> frequencies, then your A-111 
> is not buggy but you discovered a nice
> psychoacoustical phenomenon.
> 
> As rule of thumb you can say: the faster the
> modulating frequency is, 
> the smaller the modulation amount should be
> 
> 
> Florian
> 
> [*] you can test this by sending a pulswave through
> a unmodulatied 
> phaseshifter and listening only to the effectsignal
> and then listen only 
> to the original signal (no mix) you won't hear a
> difference.
> If you have a look at an oscilloscope (or wave edit
> window of a digitla 
> recording tool), you will see that the waveforms
> look completely different.
> 


Bakis Sirros - Parallel Worlds
[Doepfer_a100] group owner
http://www.parallel-worlds-music.com
http://www.myspace.com/parallelworldsmusic
http://www.shimarecords.co.uk
http://www.rubber.gr
Athens-Greece

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