[sdiy] variable midi shuffle?

[Jeff Farr]

Hmm.. That rather sucks. Myself, I have been thinking about creating a
master 'timing brain' for the studio. A hardware box, using which I can
effectivly act as a conductor to sequenced music... One more reason CV/Gate
isn't really obsolete I guess.

On 10/31/05, WeAreAs1 at aol.com <WeAreAs1 at aol.com> wrote:
>
>
> In a message dated 10/31/05 5:36:26 PM, richard at skydancer.com writes:
>
> << Impossible. MIDI is 24 ppqn, so the only way to do it would be to do
> something bizarre like send tight groups of 12 clocks for on/off beats.
> And
> 90% of MIDI hardware would be totally confused by that. >>
>
> Not impossible in the strictest sense of the word, but probably impossible
> in
> a practical sense, which is what I think you mean. You're right about how
> it
> might be done (sending clusters of clocks grouped close together, followed
> by
> "normal" clocks, followed by more clusters, etc.) Many MIDI devices may
> not
> react so very well to this kind of schizophrenic data stream, even if it
> is in
> fact "legal MIDI". It would be interesting, however, to try to implement
> such a thing with DIN Sync. DIN Sync would likely be a lot more forgiving
> about
> an unsteady stream of clock pulses, at least on devices that use the clock
> pulses to directly increment hardware counters.
>
> Even still, you certainly wouldn't have much resolution of variable swing
> adjustment, because you'd still be dealing with the rather coarse
> resolution of
> DIN Sync. I mean, a 16th note triplet takes up 4 DIN Sync (or MIDI sync,
> for
> that matter) clock pulses and a straight 16th takes up 6 DIN/MIDI pulses,
> so
> you really don't have much room for variation in a 16th-based swing
> groove, such
> as is found in much hip-hop music. 1/8th swing (typical "jazz" swing)
> would
> give you a little more wiggle room for swing variation, since 1/8th
> triplets
> take up 8 clock pulses, and straight 1/8ths take up 12 pulses.
>
> I'm still mulling over Mike Burnham's earlier question about getting swing
> out of a straight 1 pulse per note clock, such as we might use on a
> traditional
> analog sequencer (his post was titled "shuffle cmos", a few days ago). I
> think it may actually be possible (using a non-square pulse wave and some
> logic
> and timing stuff), but I haven't yet worked out the electronic details.
> Such a
> system would have the advantage of almost infinitely variable swing amount
> --
> it could even swing ahead or behind the beat (up to a point), and you
> could
> adjust the swing on the fly, just like you might adjust VCO Pulse Width on
> the
> fly. In fact, you would need to use a clock that had variable pulse width
> --
> probably some kind of sawtooth-based VCO with a variable pulse
> comparator/waveshaper, such as is found in most synth VCO's. But how to
> get two
> positive-going pulses out of each cycle? That is, the first positive clock
> pulse happens
> at the positive onset of the cycle, and the second positive clock pulse
> happening at the negative-going edge of the pulse cycle...?
>
> Mike B.
>
>
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