[sdiy] Ideal polyphonic digital reverb

[James Coplin]

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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