Regarding an LPF at the output of the BBD module, I've tried that,
and exactly like you mentioned, you filter out too many of the
goodies, so it's useless. It's just a matter of modifying DELAY
CLOCK until it goes away.

--- In Doepfer_a100@yahoogroups.com , "Adam-V" <adam-v@...> wrote:
>
> Hi,
>
> You might need to expand on a the first problem little further.
When
> you say using an envelope as a clock source, presumably you are
> modulating the HSVCO with an envelope, not clocking the BBD with an
> envelope generator
>
> Regarding the high pitched noise, it sounds like you are describing
> clock noise which is quite normal and does require a LPF to be
placed
> at the output of the BBD module in order to remove it. The obvious
> drawback of this is the potential loss of high end audio
frequencies.
>
> Cheers,
> Adam-V
> --- In Doepfer_a100@yahoogroups.com , "regimental1200"
> <regimental1200@> wrote:
> >
> > I meant 4096 stages, not 2096
> >
> > --- In Doepfer_a100@yahoogroups.com , "regimental1200"
> > <regimental1200@> wrote:
> > >
> > > I get a similar problem all the time!!!!
> > >
> > > Happens on a very intermittant basis. While using an envelope
as
> > > clock source, I smack a key and can get that typical repeating
and
> > > pitch shifting "Daaaaaaaa-daaaaaaaa-daaaa-da-da-da-da da"
noise,
> > and
> > > then when it feels like it, it stops responding.
> > >
> > > Also, depending on how I have the delay clock knob position,
I'll
> > > get this extremely high resonant noise. Sometimes it's more
> > subtle
> > > like the frequency it's producing is so high that it's not in
the
> > > audible spectrum, but its enough to hurt my ears. I fear that
> > I've
> > > even damaged a bit of my high-end with this....
> > >
> > > Is this a defect in the unit, or is that the clock noise that
the
> > > manual talks about generally requiring an LPF And if it is,
> > where
> > > exactly should the LPF be inserted
> > >
> > >
> > > --- In Doepfer_a100@yahoogroups.com , <hardware@> wrote:
> > > >
> > > > > Hi all,
> > > > >
> > > > > My tapped bbd module suddenly has a limited range, it can
now
> > > only
> > > > > do short delaytimes, probably 25-40% of the range it
should
> > > have. In
> > > > > other words: it can't produce the aliasing sound anymore.
The
> > > first
> > > > > time I fired it up it was ok, second time it had this
problem.
> > > Any
> > > > > ideas
> > > > >
> > > > > greetings, Anton
> > > >
> > > > Sounds like a fault. Probably the "heater" of the
temperature
> > > controlled
> > > > logarithmic converter of the HSVCO is defective. If you are
able
> > > to replace
> > > > an integrated circuit we can send you a new one. As all
circuits
> > > are
> > > > equipped with sockets no soldering is required but only
removing
> > > the old
> > > > circuit and inserting the new one.
> > > >
> > > > Please tell me your postal address (directly to me, not to
the
> > > Yahoo group)
> > > > and we will send you the spare part if you agree. Otherwise
> > please
> > > send the
> > > > module for repair.
> > > >
> > > > Best wishes
> > > > Dieter Doepfer
> > > > (hardware@)
> > > >
> > >
> >
>