[sdiy] MIDI Note chaining (was MPE)

Bruno Afonso bafonso at gmail.com
Mon May 7 16:09:42 CEST 2018


You can also implement different stealing methods.. steal the lowest or
highest notes, all have applications.

On Mon, May 7, 2018 at 5:22 AM Tom Wiltshire <tom at electricdruid.net> wrote:

>
> That’s not what I mean by “note stealing”, unless I’m not understanding
> you.
>
> Yes, the first synth picks up the first note, second synth gets the second
> note, etc, until all the voices/synths are full. On a polysynth, the next
> note would then steal the oldest note from the first synth so every new
> note gets played. Your algorithm seems to only play notes until all the
> voices are full, and then stops.
>
> On 6 May 2018, at 18:26, rsdio at audiobanshee.com wrote:
>
> This is easy. You always “steal” the first note and then only echo the
> remaining notes. Each subsequent synth does not see the notes stolen
> earlier, but proceeds to steal the “first” note that it sees, and then
> passes on the rest. Any synth that’s already playing a note will simply
> pass on everything until it sees a matching Note Off.
>
> As far as I can tell, this scheme should be infinitely extendable. Well,
> the actual limit is 128, since there’s no way to track multiple, distinct
> notes on the same key number. You also cannot implement voice allocation
> schemes like Round Robin, least recently used, closest pitch, or any
> algorithm that requires global knowledge.
>
> My question is why do the Dave Smith Instruments have a limit in their
> Note Chaining? What sort of feature do they provide that is algorithmically
> impossible to solve in an unlimited fashion?
>
> Brian Willoughby
>
> p.s. What MIDI messages would a synth be generating? I suppose System
> Exclusive responses might be one thing. Are you talking about mono synths
> with keyboards attached? The latter could get confusing really quickly
> unless the keyboard took priority, when possible, over the local synth
> engine. MIDI timing messages would get hairy to merge if every synth were
> trying to drive a clock.
>
>
> On May 6, 2018, at 8:23 AM, Tom Wiltshire <tom at electricdruid.net> wrote:
>
> Good question. If you don’t know how many more are connected, how would
> you know when to start stealing notes?
>
> On 6 May 2018, at 15:52, MTG <grant at musictechnologiesgroup.com> wrote:
>
> If I can steal this thread a bit (sorry)... is there some standard for
> these mono-synths that daisy-chain to become polyphonic?  I'm guessing the
> first synth takes the first note, then passes any other notes via it's
> midi-out merged with what it may be generating??  I don't mean necessarily
> a midi.org standard, just de-facto where we could play along as it were.
> I guess each synth would need to know how many more are downstream??
>
> GB
>
>
>
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