[sdiy] Ideal polyphonic digital reverb

Tue Mar 23 07:29:45 CET 2021

Michael are you saying that you have seven units each of sd3300 and pcm60?
Do you have any music/sound samples you can share?
Seems to have gone OT but enjoying this convo.
Colin

On Mon, Mar 22, 2021, 10:12 PM David Messenger, <mssngr1 at pacifier.com>
wrote:

> The 3300 has 3 delay lines...
>
>  From "The Gear Page"
>
>  >Korg SDD-XXXX Delay Rack Unit History
>
> Messages
>      1,614
>
> Jun 30, 2020
>
>      #1
>
> Delving into rack delays...I see that Korg released an SDD-1000,
> SDD-2000 and SDD-3000. Then, they also have an SDD-1200 and SDD-3300.
> I'm wondering what the release dates were for each of these (really,
> which was first, which came later) and differences among them?
>
> SDD-3000 (1983) - 1023ms, special preamp, 9 programmable presets
> SDD-1000 (1984) - 1024ms at full frequency, 2048ms at half frequency -
> all knobs
> SDD-2000 (1985) - 1092ms at full frequency, 4368ms at reduced frequency
> - 64 programmable presets, MIDI, sampling
>
> SDD-1200 (DATE?) - 1024ms (doubles when delays in series), dual delay lines
> SDD-3300 (DATE?) - 500ms per line (triples when delays in series), three
> delay lines
>
> On 3/22/2021 10:14 PM, cheater cheater wrote:
> > can you both tell me the difference between an sdd 3300 and an sdd 3000?
> thanks.
> >
> > On Tue, Mar 23, 2021 at 3:41 AM Michael E Caloroso
> > <mec.forumreader at gmail.com> wrote:
> >> Want more intriguing?
> >>
> >> MC
> >>
> >> On 3/22/21, James Coplin <james at ticalun.net> wrote:
> >>> As someone with 3x SDD-3300s sitting here this intrigues me mightily.
> >>>
> >>> James R Coplin
> >>>
> >>> On Mar 22, 2021, 8:56 PM, at 8:56 PM, Michael E Caloroso
> >>> <mec.forumreader at gmail.com> wrote:
> >>>> After years of experimentation I have concluded that a polyphonic
> >>>> synth needs both reverb and at least a pair of delays that can be
> >>>> modulated.
> >>>>
> >>>> Reverb alone was never enough.
> >>>> Modulated delays alone was never enough.
> >>>>
> >>>> I had really liked my Korg SDD-3300 triple digital delay for synths,
> >>>> which can be configured in any series/parallel/cross-coupled
> >>>> architecture you can dream of.  This gets better modulated delays than
> >>>> multi-effect boxes.  Then I saw a spare output and two spare inputs on
> >>>> the 3300, so I hooked my Lexicon PCM60 digital reverb up to it and
> >>>> that was the magic combination I wanted.
> >>>>
> >>>> Using the 3300 I can route direct signal to reverb, then process the
> >>>> reverb tales with the 3300.  Or reverb in parallel with delays.  Or
> >>>> series.  Add predelay to the reverb send.  Or multiple predelay each
> >>>> to different delay times.  World of sounds with this combination.
> >>>> Enough that I built seven sets of these for my synths for independent
> >>>> processing.
> >>>>
> >>>> MC
> >>>>
> >>>> On 3/22/21, cheater cheater <cheater00social at gmail.com> wrote:
> >>>>> let's enumerate some of the possibilities:
> >>>>>
> >>>>>
> >>>>> voice 1: vco1 -> (a1) -> vcf1 -> (b1) -> vca1 -> (c1)
> >>>>> voice 2: vco2 -> (a2) -> vcf2 -> (b2) -> vca2 -> (c2)
> >>>>> ...
> >>>>> voice n: vcon -> (an) -> vcfn -> (bn) -> vcan -> (cn)
> >>>>>
> >>>>> at a1, you want to have one of a few things:
> >>>>>
> >>>>> (i) a convolution engine that takes the output of vco1, applies an
> >>>> IR,
> >>>>> and puts it into the input of vcf1
> >>>>> (ii) same as (i) but the input is all vcos (1..n) and the output is
> >>>> vcf1
> >>>>> (iii) same as (i) but the output is all vcfs (1..n)
> >>>>> (iv) same as (i) but the input is the last few notes you played in
> >>>>> decreasing order: 1/2 * the vco from the most current note + 1/4 *
> >>>> the
> >>>>> vco from the previous note + 1/8 * the vco from the note previous to
> >>>>> that etc
> >>>>> (v) same as (iv) but you do that with the outputs
> >>>>> (vi) same as (i) but there's also input from b1 or c1
> >>>>>
> >>>>> then you want the same topology at b and c
> >>>>>
> >>>>> They're all obviously going to have different results and different
> >>>>> applications.
> >>>>>
> >>>>> And obviously you can think about all sorts of dsp in here, not just
> >>>>> convolution, and when it comes to convolution, then not just reverb.
> >>>>>
> >>>>> On Mon, Mar 22, 2021 at 7:03 PM Mike Bryant
> >>>> <mbryant at futurehorizons.com>
> >>>>> wrote:
> >>>>>> Thought I'd change the topic name as we're definitely moving away
> >>>> from
> >>>>>> cheap.
> >>>>>>
> >>>>>> So given a polyphonic synth with unlimited voices and unlimited
> >>>> budget,
> >>>>>> what should the structure of an ideal reverb system look like ?
> >>>>>>
> >>>>>> Once there's a consensus I'll try coding it into my digital synth.
> >>>>>>
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