Basic Flex Time Editing

I think this is probably the most basic thing I could ask for help with regarding Flex Time. I have an audio track which is a recorded metronome click that I brought over from another DAW. It's in perfect time because it was generated by the DAW itself. At the end of my song, there's a ritard in the rest of the audio tracks, and I would like to slow the click track down to match. Right now the click track is not slowing down at all.

I used Beat Matching to align the tempo to the ritard, and Logic's internal metronone matches perfectly. Now I want the audio click track to match Logic's metronome. I figure I'd use Flex Time for this.

So I turn on Flex Time for the click track and after analyzing the track, Logic moves all of the clicks to a position that I would call "off-beat." This doesn't make sense to me because they were "on-the-beat" before -- from my perspective as a listener and also verifying visually.

I don't want to have to adjust every click. They were fine before. It's just the end that I want to adjust. What should I do?

Message was edited by: racingheart

MacBook Pro 17" 2.4 GHz Intel Core 2 Duo (late 2007), Mac OS X (10.6.6)

Posted on Feb 9, 2011 2:25 AM

Reply
20 replies

Sep 20, 2012 4:19 PM in response to welshwiggle

OK Guys


I got a result. Not entirely sure why.


1 With all my drum tracks with tempo supposedly embedded I then quantized to 16ths setting the Q range to 1/192 as the playing was on the whole fine apart from the tempo fluctuation thru the pice.


The whole point of the pain her is that I especially wanted to lock my bass player to the drums.


Amazing when I apply a monophonic flex to the bass track again with 16th note and 1/192 Q It actually quantizes pretty darn good.

Sep 20, 2012 11:24 PM in response to welshwiggle

welshwiggle wrote:


The painful thing is it appears to be transient by transient MANUALLY which is a drag


Any 2012 updates on how Logic might do this better now?


Hi, it's good to hear that you got a solution! Logic's several years old way to deal with this automatically is to use Beat From Detection. Check the manual, p. 1045, and see if you can make it work (there could possibly be a bug in there, not sure...). The section is called "Automatic Beat Mapping of Regions".

Sep 21, 2012 12:39 AM in response to ZXC

ZXC wrote:


Logic's several years old way to deal with this automatically is to use Beat From Detection.

That's "Beats from Region", of course. :-) Sorry for trying to explaining anything complicated too early in the morning. :-)


From the pdf-manual:


The Beats from Region button in the Beat Mapping track header activates an automatic Beat Mapping method that uses a self-recorded metronome region.



To use the automatic Beat Mapping feature

1) Select the region you want to make the project tempo display to, then click the Beats from Region button in the Beat Mapping track.

The Set Beats by Guide Region(s) dialog opens.

2) Choose the most appropriate note value in the Note Value pop-up menu. The Note Value defines the timing resolution that is used to create the map.


3) Choose between the following two algorithms:

Tolerate missing or additional events: This algorithm only uses tempo-relevant transients for the beat mapping process (selection is based on the project’s current time signature). This avoids drastic tempo changes, which are usually undesirable. You should use this algorithm for audio regions.

Note: Whenusingthisalgorithm,youwillachievethebestresultswithreasonablytight percussive material. The algorithm will not work well on recordings of performances that have been played too far off the bar, or provide inconsistent tempo information. The same is true for very complex, layered drum tracks or melodic material that doesn’t provide enough transient information.

Use exactly all existing events: This algorithm uses every detected transient for the automatic beat mapping process. You’ll only get usable results when using this algorithm to analyze (MIDI) regions that provide an event for each tempo-significant transient.


4) Click OK to perform the automatic beat mapping process.

Logic Pro scans the region based on your chosen algorithm and performs the beat mapping process.



Tip: If using the “Tolerate missing or additional events” algorithm, assign the respective transient manually before using the Beats from Region function, as this will ensure that a certain beat is always part of the beat mapping process. The resulting map will always contain this manually mapped position. If Logic Pro is not able to find a consistent tempo, you should try the following: Manually map (up to) two significant beats and click the Beats from Region button again. The two manual mapping points define a resulting tempo that will be used as the basis for automatic beat mapping. If this method fails, record a MIDI region which contains synchronized regular notes, and use this as a guide region.



To beat map audio material that contains tempo changes

  1. 1 Cut the audio material at the precise position of any tempo changes.
  2. 2 Lock the SMPTE position of each audio region.
  3. 3 Select the first region and perform the automatic beat mapping process as already described.
  4. 4 Continue with all following audio regions.







This thread has been closed by the system or the community team. You may vote for any posts you find helpful, or search the Community for additional answers.

Basic Flex Time Editing

Welcome to Apple Support Community
A forum where Apple customers help each other with their products. Get started with your Apple Account.