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Subject:Smooth, Easy way to change tempo?
Posted by: spinweb
Date:6/9/2006 1:55:58 PM

Ok, bear with me. It's been awhile. Let's say I have an ACID project with 20 tracks, including loops and oneshots and tracks I've recorded into ACID. Now, on bar 20 I want to crank the tempo up 20 bpm. When I do this, I find it works great for all the pre-recorded ACIDized loops, but all my singing and guitar parts are now out of key.

Is there an easy way to transpose them all at once? Or, if not, what is the best way.


Subject:RE: Smooth, Easy way to change tempo?
Reply by: spinweb
Date:6/13/2006 12:03:54 PM

No answer after 5 days... Is this a really stupid question?

Subject:RE: Smooth, Easy way to change tempo?
Reply by: thirdnostril
Date:6/13/2006 1:15:19 PM

OK, ACID loops are so smooth during tempo changes and transpositions because the WAV file containing the loop also has some extra data in there, called metadata. This contains information about the tempo the loop was originally recorded at, its key, and maybe some other stuff. When you change tempo, the metadata (and by the way, a loop with this ACID metadata is known as "an ACIDized loop") keeps the notes the same.

But tracks you record yourself don't have any metadata. It might be nice if ACID put them in as you record--wouldn't THAT be juicy!--but it doesn't. (ACID would probably cost a lot more if it did.) So when you change tempo on a recorded track--nothing happens. (Same thing with ACID "one-shots.") Your recorded tracks are the same--but since you recorded them to ACID loops at a certain tempo, then changed that tempo, your recorded tracks are no longer in key with the loops.

Sound Forge CAN inject ACID metadata, but an easier workaround would be to lay out your loop tracks, work out your tempo changes, and then lay down recordings last. ACID can't tempo-change or key-change manual recordings without the sounds changing.

Subject:RE: Smooth, Easy way to change tempo?
Reply by: vespesian
Date:6/13/2006 5:54:38 PM

Can't he just beatmap or stretch his recorded loops, then render them - if he wants to use them in other projects - as acidzied wav files, or loops?

Subject:RE: Smooth, Easy way to change tempo?
Reply by: Ranger Bob
Date:6/14/2006 1:54:15 AM

Open the clip properties of your recorded tracks, make sure the box, "Preserve pitch when stretching" is checked. If you're using the first release of Pro 6 be sure to upgrade to v6a.

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