[sdiy] Multi-source crossfader

Kyle Stephens lightburnx at yahoo.com
Thu Feb 5 18:15:07 CET 2009


Yeah, everything post the VCDO would be analog.

Another question: what kind of prom would I use? (And I'll worry about how it'll get burned when it comes to that...)


_Kyle


--- On Wed, 2/4/09, Scott Nordlund <gsn10 at hotmail.com> wrote:

> From: Scott Nordlund <gsn10 at hotmail.com>
> Subject: RE: [sdiy] Multi-source crossfader
> To: Synth-diy at synth-diy.org
> Date: Wednesday, February 4, 2009, 3:32 PM
> I doubt 16 bit waveforms would make a huge improvement. 
> Since you're (presumably) only going to be storing
> full-scale raw waveforms, and doing any amplitude processing
> and crossfading either in the analog domain or with
> higher-bit digital, 8 bits shouldn't really be that much
> of a limitation.
> 
> ----------------------------------------
> > Date: Wed, 4 Feb 2009 12:19:58 -0800
> > From: lightburnx at yahoo.com
> > Subject: Re: [sdiy] Multi-source crossfader
> > To: Synth-diy at synth-diy.org
> >
> > Funny this comes up, as I got on the topic of vector
> synthesis (mentioned on one of JH's scanner project
> pages) a few days ago.
> >
> > I picked up an old motor speed controller at a surplus
> shop a while back - it's got a nice sloped case, about
> 12" x 8", with a center-returning joystick in the
> middle. I gutted out the board and was left to wonder how to
> best make use of it. After some "research" (see:
> Wikipedia jumping), the idea of shuffling through wavetables
> sounds like a great way to wring the most variety out of the
> two axises of a joystick, a la vector synthesis, ie: the
> Sequential Circuits Prophet VS.
> >
> > Apart from reading up on the Prophet VS and its vector
> interface, I've looked at some existing DIY
> implementations of wavetables, namely those of Ken Stone
> (http://www.cgs.synth.net/modules/wavetable.html), and Keith
> Winstanley (http://home.freeuk.net/lowpass/VCDO.html).
> There's a .zip available on Keith's page of the
> original Digisound VCDO module from which both are based.
> >
> > I'm curious about what kind of modern upgrades
> could applied to this kind of design. 64-bit eproms would be
> a bit overkill, but even trying a 16-bit would have some
> more room for variety with the wavetables (versus the
> original 8). If I want to get back to that lofi character, I
> could just drop address lines into the DAC. And if nothing
> else, a newer eprom would suck less juice - the ones
> prescribed for the Digisound one took up to 500mA (yes, half
> an amp!).
> >
> > All this being said, I get the general theory of the
> process, less so the specifics of implementation. I've
> been tackling the VS service manual
> (http://www.retrosynth.com/docs/pvs/), and some of National
> Semiconductor's application notes on DACs - any other
> suggested reading?
> >
> >
> > It's interesting that I pass by Sequential's
> address listed in the service manual (3051 North First
> Street, San Jose, CA, USA) on my way to school :3
> >
> > And Google Maps says Sequential still has a space
> there:
> >
> >
> http://maps.google.com/maps?f=q&source=s_q&hl=en&geocode=&q=3051+N+First+St.,+San+Jose,+CA,+usa&sll=37.394539,-121.934209&sspn=0.007825,0.013819&g=3051+N+First+St.,+San+Jose,+CA,+usa&ie=UTF8&ll=37.396107,-121.934187&spn=0.007825,0.013819&z=16&iwloc=r0
> >
> >
> > _Kyle
> >
> >
> > --- On Tue, 2/3/09, JH.  wrote:
> >
> >> From: JH. 
> >> Subject: Re: [sdiy] Multi-source crossfader
> >> To: elektrodwarf at yahoo.se,
> Synth-diy at synth-diy.org
> >> Date: Tuesday, February 3, 2009, 11:18 PM
> >>
> http://www.jhaible.heim.at/interpolating_scanner_and_scanvib/jh_interpolating_scanner_and_scanvib.html
> >>
> >> JH.
> >>
> >> ----- Original Message -----
> >> From: "Karl Ekdahl" 
> >> To: 
> >> Sent: Tuesday, February 03, 2009 10:44 PM
> >> Subject: [sdiy] Multi-source crossfader
> >>
> >>
> >> Hi list, i'm in need of a multi-source
> crossfader,
> >> specifically i'm going to
> >> have a fader going inbetween four waveforms
> (square, saw,
> >> tri, sine). I
> >> started designing some kind of BTJ-contraption but
> figured
> >> perhaps someone
> >> here already made one?
> >>
> >> Thanks
> >>
> >> Karl
> >>
> >>
> >>
> >>
> __________________________________________________________
> >> Ta semester! - sök efter resor hos Kelkoo.
> >> Jämför pris på flygbiljetter och hotellrum
> här:
> >>
> http://www.kelkoo.se/c-169901-resor-biljetter.html?partnerId=96914052
> >>
> >> _______________________________________________
> >> Synth-diy mailing list
> >> Synth-diy at synth-diy.org
> >>
> http://synth-diy.org/mailman/listinfo/synth-diy
> >>
> >>
> >> _______________________________________________
> >> Synth-diy mailing list
> >> Synth-diy at synth-diy.org
> >>
> http://synth-diy.org/mailman/listinfo/synth-diy
> >
> >
> >
> >
> >
> >
> >
> > _______________________________________________
> > Synth-diy mailing list
> > Synth-diy at synth-diy.org
> > http://synth-diy.org/mailman/listinfo/synth-diy
> 
> _________________________________________________________________
> Windows Live™: E-mail. Chat. Share. Get more ways to
> connect. 
> http://windowslive.com/howitworks?ocid=TXT_TAGLM_WL_t2_allup_howitworks_022009
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at synth-diy.org
> http://synth-diy.org/mailman/listinfo/synth-diy


      



More information about the Synth-diy mailing list