Doepfer

Hi,

I've just bought myself the Doepfer a-100 basis system mini, plus a few additional modules in a P6 case and I have a couple of (probably obvious) questions.

Firstly, when I trigger the modular via the A190 midi cv interface, there is a click that precedes any  envelope sent out, even with the LPF filter completely closed I can still hear - it almost seems like clock CV bleeding through in to the audio signal - if that's possible - Does anyone know a solution to this?

Secondly, when triggering a VCO via the LFO going straight out through the VCA I can hear the LFO pulse bleeding through as well (slightly ahead of the VCO signal), even on low range setting - is this normal?

Many thanks,

Rupert Lally

Sent from my iPad

Hello

> Firstly, when I trigger the modular via the A190 midi cv interface,
> there is a click that precedes any  envelope sent out, even with the
> LPF filter completely closed I can still hear - it almost seems like
> clock CV bleeding through in to the audio signal - if that's possible
> - Does anyone know a solution to this?

how is the attack setting of your VCA envelope?
Fast attack rates on the VCAs envelope will cut a hard edge in the wave
of the audiosignal. This will be heard as a click and it is normal. It
will be more nearable the darker the signal is (means, If you turn down
the cutoff of the VCF it will be heard better!)

Solution, simply turn up the attack rate a little bit.

> Secondly, when triggering a VCO via the LFO going straight out
> through the VCA I can hear the LFO pulse bleeding through as well
> (slightly ahead of the VCO signal), even on low range setting - is
> this normal?

What do you mean with "triggering a VCO via the LFO"? A VCO has no
trigger input and it cannot be "triggered". Please explain your patch 
more detailed.


Florian

> Hello again! Is there a module that resets waves every time they're triggered? I think clicking might be reduced if a wave was always triggered at the beginning of its cycle. The DSI Tempest does this pretty successfully. Just food for thought :). Regards, Steve 

Interesting thought.  Would hooking the gate up to the oscillator's sync input accomplish this?  I know that's not what it's designed for, but would it work?

> Hello again! Is there a module that resets waves every time 
> they're triggered? I think clicking might be reduced if a wave 
> was always triggered at the beginning of its cycle. The DSI 
> Tempest does this pretty successfully. Just food for thought :). 
> Regards, Steve 

The hard sync input of the VCO or the reset input of the LFO can be used.

Best wishes
Dieter Doepfer

Hello Steve,

as Dieter wrote you may use the Hard-Sync. But it won't solve your click 
problem, because the hard sync resets to the minimum of the waveform. To 
avoid the click at very fast attack rates you would have to reset to the 
zero crossing (=the middle) of the waveform.

The tempest can do it because the waveforms are generated digitally.

Florian

On 14.11.13 01:06 , modular_steve@yahoo.com wrote:
>
>
> Hello again! Is there a module that resets waves every time they're
> triggered? I think clicking might be reduced if a wave was always
> triggered at the beginning of its cycle. The DSI Tempest does this
> pretty successfully. Just food for thought :). Regards, Steve

Maybe it can be worked around like this:

The oscilator's wave goes to comparator positive input. (Negative to GND) It's output goes to logic AND with Gate. The AND's output goes back to comparator's positive and to the VCA.

This system should delay gate right until nearest zero-crossing and keep it to the end due to feedback.

I have no such modules but I remember that Doepfer makes such modules.