[sdiy] Ideal polyphonic digital reverb

Michael E Caloroso mec.forumreader at gmail.com
Tue Mar 23 06:02:26 CET 2021


SDD-3000 is a single digital delay, no MIDI

SDD-3300 is three digital delays with MIDI.  Complete description on my webpage:
http://analoguediehard.com/studio/effects/korg_sdd-3300/index.html

Both are programmable.  Another difference is the LFO: four waveshapes
are available on the SDD-3000, while the SDD-3300 is triangle
waveshape only but each delay unit has two LFOs and the LFOs between
delay units can be phase offset.  That last feature is important for
stereo modulated delays that do not cancel in mono.

MC

On 3/23/21, cheater cheater <cheater00social at gmail.com> 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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>


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