MIDI Editing Question

[jbsound]

Question: How can I adjust all MIDI tracks to a different tempo?

Details:
A new project was set up at 150 bpm when in actuallity it should have been set up at 75 bpm. All MIDI tracks have been recorded with the higher speed.

The issue now is how to adjust the project tempo and have the tracks play at the new speed. If I just change the tempo, the MIDI tracks play half their speed. However, they need to be adjusted so that what originally was audible at 150 bpm sounds the same at 75 bpm.

I played around with the Region->Scale Tempo command, but it wouldn't do what I am after.

Any help and suggestions are greatly appreciated!

Thanks,

JB

[Spikey Horse]

There are many was to set/change the tempo in DP - I suggest a quick scan through pages 573-580.

[jbsound]

I appreciate your response, Spikey. It's not quite what I'm after though. I am aware of the ways of being able to change the tempo through the methods outlined in that chapter. However, what I need to do is similar to applying meter changes in DP.

In fact, changing the meter from 4/4 to 2/4 for example allows me to specify whether I only want to move the bar lines or whether I want to realign the music automatically.

Maybe I'm just not understanding how this can be done with the Change Tempo method.

Any suggestions you have?

JB

[Spikey Horse]

page 573 first para (under the diagram)

Isn't that it?

If not please explain why not....

[jbsound]

That's what I thought at first would work, but it doesn't. Here is why:

The MIDI tracks were recorded at 150 bpm. However, they should have beeen recorded at 75 bpm, half the specified beats per minute.

When the sequence is played back at 150 bpm, everything sounds as it should. However, the counter runs twice as fast as it should. This is especially problematic since we are synchronizing externally to a sequencer running a drum module (with patterns).

On the other sequencer, everything runs twice as fast, as the patterns are played back at 150 bpm (to match the counter on DP). Simply changing the BPM on the drum pattern sequencer won't do either, as this now messes up the patterns and when they come in.

Back to making the change in DP:

Simply changing the beat value from a quarter note to a whole note will change the BPM to 75 in the DP project. However, the counter still runs the beats as if this were a 150 bpm piece.

What needs to happen is that the MIDI notes remain their position as far as the actual timed events is concerned. The counter simply needs to be realigned to 75 bpm.

I may have overly complicated the explanation. It's a simple matter really. Just can't figure out how to do it in DP.

To demonstrate:

1) Create a new project at 150 bpm and record a track.
2) Now try to change the BPM to 75 with the MIDI events coming in at the same spot time wise where they came in before. In other words, what took 2 seconds between one note to the next, should still take two seconds, even though the BPM were changed. That is the challenge at hand...

JB

[Spikey Horse]

OK I get you - What you need to do is a combnation of what I mentioned above and Scale time (page 551).

So it's a two step proccedure.

Think of it as stretching everything- time and MIDI and then shrinking the MIDI back down again what it was leaving time stretched. Oh no hang on in your case you will be shrinking time+ MIDI and then restretching the MIDI!

Actually it doesn't matter which way round you do it, you can change MIDI first then both, or both and then MIDI, if you see what I mean.

Er... hope that makes sense - it does work i did it the other day.

[jbsound]

Alright, I figured it out. The key to doing what I needed to do is changing the time with Region->Scale Time and entering a value of 50%. After that adjusting the tempo from 150 to 75 bpm would bring everything back into timed alignment.

Thanks for helping out. I guess I was asking the wrong question. This wasn't only a matter of a tempo change, but more of a scaled time change.

JB

[Spikey Horse]

Yey! - we figured it out simultaneously!

[jbsound]

Ah, we posted at the same time!

Totally agree with your post. Scale and tempo change does the trick.

Thanks again for all your help and willingness to investigate further!

Have a great week!

JB