>>Any advice is appreciated, especially from those who have tried BBD<<

hi,
I'm not into maths, but i hvae 128, 256 and 512 stagers plus also a
4096stager.
a Frined has the 2048.
and i used to patch only with BBDs during 16 months or so, sometime back.

Overall the most interesting for me are the 256 and 512.
the 128 stager can be modulated more precise,
but for my Ears the sound is to thin.
But i must admit that i have not used it so much.

the 256stager seems overall the most interesting for me,
when counting everything together.
For Resonator Sounds the 512stager is the nicest for my Ears.

It is more belly and delivers wonderful fat tones.
the 256stager is allready thinner.

i can do also with the 496stager Resonator sounds when boosting the
Feedbackpath btw.

In general i have a 256stager and a 512stager patched together to a mixer.
and to be honest: also a third BBD.
I replaced there the 128stager with my second 256stager.
Btw.: i have patched once with three BBDs the nicest Bells i ever heard.

My recommandation would be:
take a 256 AND a 512 !
you can patch funny things with both together ;)
Biiiig experimeting Field ! loads of fun !

H.






--- In Doepfer_a100@yahoogroups.com , "Michael Wagner"
<michael.wgnr@...> wrote:

>
> Hi Doug,
>
> Definitely a late reply, sorry for that.
> I just received my 256-stage-BBD today,
> and couldn't yet test it, but I just tried to
> verify your claims. In theory, you've got the
> math right, but the manual of the BBD states
> the following:
>
> "[the clock oscillator frequency] depends upon the BBD
> used in the module and is related to the max. clock
> frequency of the BBD in question (pls. refer to the table on
> page 3). It is about 250 kHz for BBDs with 2048 and 4096
> stages and about 450kHz for BBDs with 1024 stages and
> less (i.e. a bit more than the max. clock frequency of the
> specs in the data sheet)."
>
> Furthermore, there is a table with the shortest available
> delay for each BBD. E.g. the 256-stage BBD would have,
> acording to its specification, 0.64ms minimum delay time,
> which translates to 1562.5 Hz, that is roughly a G6.
>
> So, I hope that helps a bit; and also hope I got the details
> right.
>
> -Michael
>
> On Wed, Apr 30, 2008 at 6:01 AM, Doug <dougc356@...> wrote:
> > Hi folks, according to my calculations, the number of BBD stages is
> > related to the highest possible musical note via karplus strong
> > synthesis as follows:
> >
> > 128max=G5
> > 256max=G4
> > 512max=G3
> > 1024max=G2
> > 2048max=G1
> > 4096max=G0
> >
> > Am I wrong Here's how I got there:
> >
> > 1) the frequency of the karplus strong loop is the note that will be
> > heard as the loop attenuates. This frequency F is equal to
> > F = Fs/N where Fs is the sampling rate and N is the number of samples.
> >
> > 2) According to the Doepfer documentation for the A-188-1, the design
> > clock range of these modules is roughly 10kHz to 100kHz. I am assuming
> > this is the range of acceptable values for Fs. So taking Fs as 100kHz,
> > and N=128 (for the 128 stage BBD), the highest note that this setup
> > can play is
> > 100000Hz/128 = 781Hz or roughly a G5. The lowest note is not so much
> > an issue, but just for grins, 10000Hz/128= 78Hz, or roughly D#2.
> >
> > 3) For comparison, the 256 stage BBD will only manage 100000/256 =
> > 390Hz, or about a G4. And it goes down an octave with each doubling of
> > the number of stages.
> >
> > Since it appears that my guitar roughly covers octaves 1 through 4 (I
> > think) the 256 BBD is the ideal number of stages for plucked string
> > sounds.
> >
> > Any advice is appreciated, especially from those who have tried BBD
> > modules. Thanks, Doug
>