Doepfer

Hi H, thanks for these subjective impressions. Very encouraging.
Doug


--- In Doepfer_a100@yahoogroups.com, "hemi_ch"
<modulardudeldidum1@...> wrote:
>
> >>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
> >
>