[sdiy] Ideal polyphonic digital reverb

[Michael E Caloroso]

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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