Unfortunately a simple low pass filter will not do the job (otherwise we
would have added it). You need a filter with a steep slope 24dB or more)
that follows the clock frequency of the A-188-1 or -2. The low cost solution
of a fixed filter that was used in older BBD devices does make sense only
for a norrow clock/delay range so that a compromise between filter frequency
(and consequently dullness of the sound) and clock suppression can be made.
But a fixed filter does not make sense with the A-188-x modules as they have
an extremely wide clock/delay range (typ. a few hundred Hz up to 400 kHz
according to the BBD type). As mentioned several times the planned dual SC
filter will fill this gap. But even another VC lowpass of the A-100 can be
used for this task.

And - maybe I'm the only one - for certain applications I definitely want to
have the clock noise and the aliasing effects. The A-188-x modules are no
guitar stomp boxes but part of a modular (!) synthesizer system.

Best wishes
Dieter Doepfer

> -----Ursprüngliche Nachricht-----
> Von: Doepfer_a100@yahoogroups.com
> [mailto: Doepfer_a100@yahoogroups.com ]Im Auftrag von J S
> Gesendet: Montag, 23. Oktober 2006 16:20
> An: Doepfer_a100@yahoogroups.com
> Betreff: Re: 1 Two more sound examples for the A-188-2
>
>
> Why would one want to have a highpitched irritating sound mixed with his

sound

>
> I'm going to buy the module, but I do think a simple lowpass filter(with a
> on/off switch) would make it a whole lot better.
>
> And it won't cost more than a few dollars.
>
> That Higpitched noise is in my view very unwanted(me being a
> diplomat) and I
> would have to reserve one of my filters especially for the BBD
> module..........
>
> BTW could it be filtered with a slew limiter
>
>
> Greetings,
>
> jean
>
> 2006/10/23, ilanode < techmeier@... >:
> >
> > --- In Doepfer_a100@yahoogroups.com <Doepfer_a100%40yahoogroups.com>,
> > bruce thedekaa <brztdk@...> wrote:
> > >
> > > Hi,
> > >
> > > I don't understand why you are glad that there isn't a
> > > dedicated filter inside the module.
> > It was lenghtly discussed on this list when the chance for a BBD-delay
> > has brought up. IIRC the idea was that the clock noise *can*
> > contribute desirably to the sound while it can be removed by filtering
> > as well. The other way round would not feasible. However, with all the
> > confusion and misconception in mind which univitably arose around the
> > clock noise it seems to be Doepfer's most daring business decision.
> > For example on a German synth forum s.o. thought it's module faulty
> > bcs. he tried to put the filter btn clock out and clk in and the
> > results doesn't have been up to his expect.. Guess, questions like
> > this will keep D and this list busy for some time to come :), Regards,
> > Ingo
> >
> >
> >
>
>
> [Non-text portions of this message have been removed]
>
>
>
>
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