Why is beat mapping mangling midi?

I have a midi recording of a performance of JS Bach's Prelude one from WTC book I. I noticed that doing beat mapping with the midi track led to some strange results.
Then I bounced my midi file to audio and used the bounce to beat map. Then it was even more clear that there is a problem with beat mapping, because I could hear the audio and midi getting out of alignment with each other. Sometimes the effect is slight, sometimes very dramatic. 
Here's before and after screenshots of some midi mangling. I don't know if it's obvious from the images, but after mapping measure 35, beat 2, beat 1 is seriously warped, seeming to slow way down and then speed up. 
I tried clicking the 'protect midi' box, but the midi still got mangled. 
My takeaway (for now): only try to beat map audio. Don't let my midi files anywhere near a beat mapping process.

SMPTE-Lock the Regions before messing with the tempo list.
Christan

Similar Messages

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    I know, that there is a way to use automatic beat mapping with midi file. Is it possible with audio file?

    No, I didn,t mean that. I know how to work with the function. What I am asking is if there is a way to process automatic beat mapping without the need of manually grag every transient. I am working on acoustic drum tracks now and I think I,ll kill someone soon!

  • Beat Mapping is changing speed of audio region, not the metronome!!!

    Hi Everyone,
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    David
    MacBook   Mac OS X (10.4.9)   2.0 GHz Processor, 2 GB RAM

    Well after many hours of searching through Logic Forums and flipping through the Logic Reference Manual, all to no avail, I've finally figured out what the problem was. I needed to uncheck the "Follow Te(mpo)" option in the Region Parameter Box for the region I was trying to beat map. The beat mapping process wasn't actually changing the length/speed of my audio region like I said it was in my initial post; it was simply playing over it slower or faster in order to preserve the audio-to-tempo ratio as I made the tempo slower or faster. All I needed to do was uncheck that little box and now beat mapping works exactly as described in the Reference Manual. WHY ON EARTH is the "Follow Te(mpo)" box not mentioned when discussing beat mapping?! More importantly, why is it not mentioned ANYWHERE in the entire Reference Manual?!?!? NOT ONCE!!! unbelievably frustrating.
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    Hi Cauldblast, to save me a lengthy text explanation, here's everything one should know about Beat Mapping:
    http://www.youtube.com/watch?v=p5Ro592Wea8&feature=share&list=PLpJ7oPngMm-XnTvAw vABpVdKdfzpVthcJ&index=7
    Good luck and have a nice day!

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    Hi there, noticed yet another bug in Logic 9. I'm trying to do beat mapping according to a virtual instrument region (the last region in a song), and mapping Logic's quarter notes to their respective places results to a slightly different tempo than I anticipated - bpm is 990.
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  • Copying Beat Mapping Info from Tempo track

    Hey all.
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  • Trouble Beat Mapping

    Hey Guys,
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    the Logic Beat Mapping is saying it's around 125.1537
    You're using the term Beat Mapping in a way that's different from the way that term is used inside Logic (and this happens a lot). Maybe a better term for what you're doing would be tempo detection.
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    There are some other useful techniques for tempo detection inside Logic, but I won't get into that right now.
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    I think you must be a pretty good tapper. When I use various methods to determine the tempo for that song, the number I come up with is 117.9873 bpm. (That excess precision is admittedly pointless; I could have said 117.98 or 117.99 and it would make no practical difference.)
    it needs to match up the first beat of the WAV wit hthe first beat of the session
    For various reasons I usually find that it's a good idea to leave a measure or more of silence at the start of a project. Later on when you bounce, you're not obligated to include this silence in the bounce.
    The main thing is to make sure the first beat of the region matches up with the start of a measure. That is, if the first beat of the song is a downbeat (the first beat of a measure). In this song, that happens to be the case.
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    Things get more interesting when you pick a record that embodies a varying tempo (which is more common with older records, but it still happens). If you run into that and you have questions, just ask.

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    I recorded a track without a click, very rubato. Then I manually played in 1/4 notes on a midi track. I used "Beats from region" on the beat mapping track. After that when the song starts to play, if I click on a track or do just about anything with the computer keyboard I get the beach ball and Logic becomes very sluggish or unresponsive. It I revert back to the previous version of the song, without the beat mapping, there is no problem. I did notice that the rubato tempo was screwing up the beat sync on the tape delay plugin, so I put it in bypass, then removed them.

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    the word "PRO" in Logic is focused to professional musician... including students and amateurs can enjoy a fabulous experience ... it is very similar as the musicians or soloists when they are in a professional production environment.
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    just my 2 cents
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    The image below is of the midi guide track post Beat Mapping of a 4/4 funky song in which the rhythm turns around just before the bridge displacing the beat a semi-quaver and the groove continues.
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    Message was edited by: musicspirit

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    Hi,
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    I have beat mapped a wave file taken from an AIR sample.
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