vmf007
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Changing tempo to an already created midi file
Hi forum, I recorded a keyboard track many years ago, and now I noticed we tracked it at 100bpm with the metronome off because it wasn't in sync, but now many years later I'm trying to add tracks to the song but the tempo is really supposed to be 60bpm. Is there a way to change it to the right tempo? I tried dumping the midi track into a new session already set at 60bpm, but it sounds way slower than it's supposed to be. Thanks in advance!!!
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AllanH
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Re: Changing tempo to an already created midi file
2017/06/18 13:57:01
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promidi
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Re: Changing tempo to an already created midi file
2017/06/18 14:05:52
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But, wouldn't setting the changing the tempo to 60 BPM make the MIDI file play slower anyway.
Or do you wish to change the designated tempo of the MIDI but have it playing at the same speed?
If that is the case, what you can do is load the MIDI file into Sonar normally. Then change the tempo to 60. At this point the some will play 0.6 times slower. To get the MIDI playing back at its original speed, select all MIDI tracks, then Process | Length, make sure Start times and Durations are ticked and enter 60%. That will get the MIDI to play at the original speed but change your tempo will remain at 60 BPM.
Bear in mind, if you do this, then the notes will likely no longer be aligned to measures.
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vmf007
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Re: Changing tempo to an already created midi file
2017/06/18 14:56:46
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Thanks Guys, I tried changing the Process length to 60% like you said, and it works! That's the good news, the bad news is after listening to it, the playing was off, so I might have to get my keyboardist back in here to re-record it, cause I think he can re play it much easier than it would be for me to fix all the midi information. But thanks again guys!!!
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chuckebaby
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Re: Changing tempo to an already created midi file
2017/06/18 18:02:36
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Just open it in the Piano roll view and either move notes or quantize.
Midi is easy to adjust tempo. Once it is in the timeline, simply change the project tempo.
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bvideo
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Re: Changing tempo to an already created midi file
2017/06/18 18:54:13
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If by "off" you mean A) it doesn't hit all the beats at a constant 60 BPM, that's fixable. If "off" means B) it doesn't sound any good, that's a candidate for replay.
If A), the thing to do is use "set measure-beat at now" as an easy way to make appropriate small adjustments to the tempo to match the playing.
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azslow3
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Re: Changing tempo to an already created midi file
2017/06/18 22:18:44
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If MIDI track by itself is in sync with other (audio) tracks (f.e. if everything was recorded without click but in sync) and the only thing you need is to apply new (not constant) project tempo map (extracted from other tracks or rendered MIDI) to MIDI tracks, you can use this: http://www.azslow.com/index.php/topic,286.0.html (search for "Apply tempo map").
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vmf007
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Re: Changing tempo to an already created midi file
2017/06/19 00:31:27
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<p>Thanks Guys, I tried changing the Process length to 60% like you said, and it works! That's the good news, the bad news is after listening to it, the playing was off, so I might have to get my keyboardist back in here to re-record it, cause I think he can re play it much easier than it would be for me to fix all the midi information. But thanks again guys!!!</p>
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vmf007
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Re: Changing tempo to an already created midi file
2017/06/19 00:34:38
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Came across this video after reading the new comments in this thread. This looks like what I need, but I feel my keyboardist would say tracking it over would be easier, but I'll check it out for future projects if needed. Thanks again forum... https://www.youtube.com/watch?v=FPeRp7092-c
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ChazEd
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Re: Changing tempo to an already created midi file
2017/06/19 01:08:50
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If all you need is stretch the midi file to adjust to new tempo, then hold Ctrl + Shift and click & drag the lower-right end of the midi clip, in arrangement view.
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Cactus Music
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Re: Changing tempo to an already created midi file
2017/06/19 02:17:30
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To the OP== your doing the right thing... re do it.
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mettelus
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Re: Changing tempo to an already created midi file
2017/06/19 15:43:23
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Back to the OP, I thought that importing (not drag/drop, or launching via SONAR) a MIDI file stripped off the tempo information. Is that no longer true?
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Cactus Music
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Re: Changing tempo to an already created midi file
2017/06/19 18:52:16
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Yes Importing MIDI strips away the tempo data. This is mandatory and will never change. It's the only way to plunk a midi clip in an existing song. Otherwise nothing would sync up.
But whole midi "songs" need to be "opened" to create a project with the correct data to have that song play correctly as compossed.
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azslow3
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Re: Changing tempo to an already created midi file
2017/06/19 19:42:46
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I have understood the problem as the following (am I wrong?): there is a MIDI clip which was recorded without click. So, MIDI file tempo is (constant) 100BPM while the content has fluctuating (not constant) BPM around 60.
The goal is to put correct (not constant) tempo into that MIDI file (from other view point that is setting correct for real tempo MBT in MIDI events). Then the file can be used in the project with real (for original MIDI) tempo map or in other project with different tempo.
The process has 2 steps:
a) find the original tempo. All (?) known methods require rendering the clip into audio first (if there is no other audio clip with exactly the same tempo, f.e. drums played live in parallel with the keyboard). Then applying manual or automatic (Melodyne) methods to extract the tempo.
b) once the tempo is extracted, the method in my previous post can be used to apply it (to the MIDI clip)
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