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[Poumtschak]

Hi there,

Just FWIW, I just got myself a MidiGAL, which is a nifty little DIY unit that does a lot of things MIDI wise, beyond being able to run Mutable Instruments MIDIPal firmware.

I ran the MidiGAL MIDI clock stability test with the electribe2 (1.03).

On the new tribe, according to the MidiGAL, the MIDI Clock accuracy is good but stability (aka jitter) is quite bad :
1.1%@60BPM
1.8%@120BPM (that's almost + or - 2 BPM over 4 bars)
2.4%@180BPM

https://imgur.com/a/cTjER

Neither the swing parameter nor the fact that a pattern is running or not has an influence on this.

On the other hand, the e2 syncs to the MidiGAL precise MIDI clock very well.

For those interested, there's this thread at Mutable Instruments where people post their findings with other units.

It seems the Elektron A4 and Rytm are not that accurate either, so nothing to be jealous of here.
Let's hope someone will check the Octatrack and see how it compares to Innerclocks Litmus test.


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My electribe2 lousy patterns and stuff | KORG gear: NTS-1, nanoKEY2, electribe2/2S, WS/SR, WS/EX (on storage)

[ElectribeNut]

Very handy, both the midiGal and the jitter rate. Hopefully someone else can verify your information.

[Kammikdef]

Thank you for the informative posts.

[ghostly606]

I had noticed clock jitter when syncing my Micron's delay. Sounded horrid and when troubleshooting I noticed that the BPM on the Micron was jumping around from between 19.7 and 20.3. Ended up just changing the delay to fixed rate.
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[Poumtschak]

FYI, while playing with MidiClk 0.96 and my Korg Electribe 2, I just stumbled on something odd:

Usually, the Korg MIDI clock jitters quite a lot (1.8%@120PM), but stability at 100BPM is 0.011-0.015%!



Same goes @25, 50 and 125BPM, where stability is near 0.01%, but not beyond, oddly enough. @150BPM, accuracy is 150.1 with a 2.8% jitter.

So there seems to be a sweet spot at these settings, since increasing or decreasing the BPM by 0.1 steps introduces jitter again.



Just checked with my only hardware gear available at the moment, an Eventide Space pedal: at 100BPM, its clock jitters about 0.180%
I also swapped MIDI cables to be sure.
So this is not a MidiGAL bug to me.

There's something in the electribe 2 way of generating MIDI clock that makes it supertight @25, 50, 100 and 125 BPM only.


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My electribe2 lousy patterns and stuff | KORG gear: NTS-1, nanoKEY2, electribe2/2S, WS/SR, WS/EX (on storage)

[MichalHo]

Thanks Poumtschak. Interesting info.

I do not hear any jitter or lag when midi clock slaving my unit to the Octatrack.
The electribe behaves very nicely, while one of my sets varies tempo in a range from 83bpm to 140bpm.
So far it has been one of the most reliable OT-slaves, compared to ESX, tr-8, and even to the rytm.
I get noticeable lag, which can be compensated for, as soon as i slave the e2mps to ableton, or even an external midiclock, such as ERM. (Which was unexpected)

[Ted3000]

MIDI clock pulses 24 times per quarter note.

So a BPM of 100 give you 2400 pulses in a minute. (That's 60 clock pulses per second.)

Now if you were running at 99 BPM, you'd get 39.6 clock pulses in a second.

I think these stable sweet spots correspond to evenly divisible tempos/pulses.

But even at those sweet spots, MIDI clock will have some play up and down. Everything suffers from this. The best gear uses more advanced smoothing and averaging.

https://www.youtube.com/watch?v=Cx3ERRnpFes
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[Poumtschak]

Hey, thanks for the maths.