> -----Ursprungliche Nachricht-----
> Von: Doepfer_a100@yahoogroups.com
> [mailto: Doepfer_a100@yahoogroups.com ]Im Auftrag von David Salter
> Gesendet: Dienstag, 11. Marz 2008 18:07
> An: Doepfer_a100@yahoogroups.com
> Betreff: 1 Adding a CV jack and attenuator to an existing
> variable function
>
>
> In my quest to get some more effects into my modular - this will mostly
> sit mid patch not just at the end - I was wondering if anyone can help
> me.
>
> I have been looking at the ACE 16V effects chip, supplied by Cliff in
> the UK. This is a simple device with 16 effect algorithms; 6 fixed
> reverbs and 10 effects covering reverb, delay, chorus and flange with a
> single variation adjusted by a pot. Ideally if I build this I would like
> the variation to be under CV control.
>
> The variation varies from effect to effect some acting in a linear
> fashion and some with 100 log steps so I appreciate that a CV would
> cause jumps on some of these functions but I'm willing to try it and see
> what it sounds like.
>
> However I'm not sure how to add the CV to it. any simple suggestions it
> would be nice to have a depth attenuator as well as a CV socket.
>
> many thanks
>
> David

We have several DSP effect boards in the company to try out the usability
within the A-100. Even the ACE 16V is among these units. Christian is about
to "torture" the boards to find out how they behave under analog control. We
found that many of these boards are useless for analog control because of
the artefacts or mutes caused during the alteration of parameters. I'll have
to ask him how the ACE 16V behaves. The analog control is simple: you have
to generate a voltage in the range ~ +0.1 to + 3.9 V and connect the voltage
to pin 12 of the ACE 16V. You have to pay attention that the voltage applied
to the pin 12 does not become negative or go beyond +5V. Otherwise the ACE
16V will be destroyed! A suitable protection circuit has to be added as the
voltages coming from A-100 modules are not limited to this voltage range.

Best wishes
Dieter Doepfer