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Custom midi clock tp MPC 4000 / MPC 4000 to logic via smpte

hi, to all,
My question is on MPC 4000 can you receive midi clock from an external custom midi clock and also send smpte to logic so that it they are all in time. I'm inquiring about a custom made midi clock (so I can run my external sequencers and drum machines to a finer degree without the need for a computer). can you slave mpc 4000 to midi clock while slaving logic to mpc 4000 via smpte. Can it be done, and if so how tight?
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  • Hello Kev,

    Thanks for posting.

    I suppose I'll need a bit more information to give an accurate answer. Do you have any details of the custom clock? How many Inputs/outputs? Messaging it can send?

    I'm a bit confused about the Logic aspect. You would like to discuss a setup without Logic, right? That's what the clock is for?
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  • Hi dan,
    I've been inquiring about getting a master midi clock for the mpc 4000. It will run on short accumulators which are then multiplied to derive tempo. It will have one midi out . I've seen one you can buy which claims to be 50000 times more accurate than daw clock, however only as good as mpc, 1 decimal place. Having more decimal places on tempo will allow me to line up more frequencies to whole delay times. I've got a chart with ones that work to 1 decimal place which is accurate to within 10th of a millisecond. Will the mpc still be tight. As for logic, just want to use it as a tracker so trying to sync it to mpc to use logics internal effects. I think this may be like opening can of worms (SMPTE sync). I got unitor 8 mk2, inner clock systems sync gen pro, motu FireWire external audio boxes with word clock in.
    I guess I could set tempo's up on both and punch in delay times to fx.
    Will mpc stay tight with external clock will logic lock to mpc signal, will they be tighter If I buy an aard sync?
    Start and stop commands rewind to start will feature in the clock like my dr880 drum machine.
    Thanks
    Best regards,
    Kev
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  • The digital converter sync (provided via Word Clock from a product like the Aardvark) would have no effect on the sequence timing of the MPC or Logic. It would likely improve the digital audio single of your MOTU interface, but even that can be just a subtle difference.

    It's also tough to say that an external MIDI Clock generator would yield an improvement over using the MPC or Logic as the master MIDI clock source.

    I'm a bit confused as to what you wanted to accomplish. Was there a certain reason you wanted to add the external clocks? Was Logic, the MOTU, Unitor, etc... having trouble syncing properly?
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  • Hi Dan,
    Sorry I was under the impression that logic took it's tempo base from the crystal oscillators on board the sound card and so it's tempo would be out slightly. The reason for a more accurate clock is to align more frequencies to near enough whole delay times.
    for instance..
    BPM Quarter bar delay 8th 16th
    137.6 436.0465116 ms 218 109 New freq trig/ tune 5th up trig/ tune
    587.093 d5-1 880.640 a5+1
    This ones close enough to use, its only hundredth's of a millisecond out.

    However, there's a good one at 156.25 bpm.....384 milliseconds, my external delays and effects line up correctly at this tempo its just a case of choosing the right trigger frequency. The last thing I'll do is re-correct the tuning by time stretching to bring the song back in tune. There's a lot more besides, think prime numbers as base values for delays.
    My point is that if you divide a quarter bar delay down to at least 16ths ( some only go to 16th's, the ones after are not close to whole milliseconds), you could make a list where tempo's, frequency and nearly whole delay times match up, for the want of a better word. A better tempo resolution will mean that I can get closer to more whole-ish delay times and so more tempo's I can use, the frequency is unimportant as I can retune the trigger frequency. I'm looking to buy a midi analyser from Hinton instruments and a mist board (ATARI ST) with midi on to use creator as a master clock using null data to steady the clock signal. I'll run it with my scope and HP sig gen (accurate to 9 decimal places) and see if its stable. Hopefully you'll see why now, I'm not giving too much away as to how I work either.
    Thanks for replying.
    Best regards
    Kev.
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  • Gotcha!

    I can't say for sure if a MIDI Clock or MIDI Time Code output would, in some way or another, be dependent on the converter's clock or audio sync.

    To answer your initial question, the MPCs can receive and send MIDI Clock but it will send or pass SMPTE.
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