[sdiy] Ideal polyphonic digital reverb

[David Messenger]

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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