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[SOLVED] How can I change the signature of a midi file and keep the generated audio intact?

ervinervin
edited May 2022 in General App Discussion

What I have: A midi file written in 6/4, used at 120bpm

What I want to end up with: A midi file written in 4/4, used at 80bpm, with the generated audio sounding exactly the same

What is the quickest way to do this? I suspect there might be an obvious trick if you have proper midi editing skills, but I’m stuck with the manual approach (shorten the notes by a third, and move them to remove the resulting empty spaces), which feels decidedly suboptimal. :) Please help me with your ideas. Thank you!

Comments

  • BiancaNeveBiancaNeve

    Play the midi file from one daw to another?

  • espiegel123espiegel123

    @ervin: do i understand that you want each measure of the original to correspond to a measure in the new sequence? I believe Xequence 2 has a feature where if you change the length of a midi clip, it stretches/compacts the note durations. you might be able to change the time signature to 4/4 and then shrink the midi clip by the appropriate amount. If you have Auria Pro, I believe you can do the same thing.

    If you don't have those, confirm that what I said is true before investing.

  • ervinervin

    @BiancaNeve @espiegel123 - thank you both, I can and will try both suggestions.

  • rs2000rs2000

    Since all you want is identical playback, I would use the free t2mf and mf2t commandline utilities.
    They allow you to 'hack' the properties like bpm and time signature of a MIDI file.

    mf2t converts a MIDI file to editable text and t2mf converts it back to MIDI file format.

  • RockBottomRockBottom

    programs that run on Windows XP ?

  • maxwellhousermaxwellhouser

    @ervin If I needed to do this I would be using Pro Tools on desktop. If you run out of luck you can send it to me and I’ll convert it.

  • ervinervin

    @rs2000 @maxwellhouser thank you for your tips as well!

  • rs2000rs2000

    @RockBottom said:
    programs that run on Windows XP ?

    t2mf and mf2t run inside the cmd window on XP, 7, 10 and most likely 11 too.

  • ervinervin

    @rs2000 said:

    @RockBottom said:
    programs that run on Windows XP ?

    t2mf and mf2t run inside the cmd window on XP, 7, 10 and most likely 11 too.

    Great, I can do windows 10. Thanks again!

  • rs2000rs2000
    edited May 2022

    I've just checked the old links @ervin, some are dead so I recommend to grab them from http://midiox.com:
    http://midiox.com/zip/mf2tXP.zip

    If required, there's a nice tutorial on youtube:

  • ervinervin
    edited May 2022

    Update - I ended up doing a version of the daw-to-daw process suggested by @BiancaNeve. I sent each midi track in Xequence to a separate instance of Atom in AUM, with Link turned off to avoid tempo sync and quantization off to avoid "dehumanisation". 🙂

    Thanks again for all the tips, some of them I think I can use in other situations, and text-editing the midi file also looks promising.

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