Subject:songs with varying tempo

Posted by: hall2

Date:7/31/2003 5:46:54 AM

I'm having trouble using a song with varying tempo in Acid Pro 4.0.

I followed the steps found in this link:

http://www.sonicfoundry.com/support/SupportProduct.asp?FamilyID=2&Family=ACID&TopicID=4&DetailID=1409

...which creates a tempo map.

All is well until the last step:

13. Render the song out to a new file, and you have an even-tempo'ed song

My rendered file still has tempo changes...

help

Subject:RE: songs with varying tempo

Reply by: Iacobus

Date:7/31/2003 2:33:19 PM

What you're actually doing is matching the project to the song with the varying tempo. The song with the varying tempo does not change temporally; it stays the same. It's the project that wraps itself around the song.

If you match the project with the song, naturally it will also have varying tempo.

I imagine what SoFo was getting at was an "even-tempo'ed" song refers to the project matching the song as it changes tempo.

HTH,
Iacobus

Subject:RE: songs with varying tempo

Reply by: hall2

Date:7/31/2003 6:59:28 PM

thanks for the quick reponse!

I was hoping that by rendering the track that acid would then view it as a continuous sequence of individual measures (since each measure is now marked with it's own tempo). This way when the rendered version is opened in a new project, all of the measures would conform to the project tempo, thus becoming the same tempo.

What then is the purpose of step 13 (rendering to a new file) since tempo changes are part of the project (not the track)?

Subject:RE: songs with varying tempo

Reply by: dorkus

Date:8/1/2003 11:53:35 AM

That step is wrong.

Subject:RE: songs with varying tempo

Reply by: Iacobus

Date:8/1/2003 2:35:43 PM

Actually, I'm not exactly sure what SoFo was getting at here, because if you render out such a file, there's really no way ACID knows what measure is where and at what tempo. It is a One-shot after all. (One-shots are never touched temporally; you could speed up the tempo to 300 BPM and the file would still sound the same.)

I do know that what you hear in an ACID project is what you'll get in a rendered file. Always.

Are these tempo changes extreme, or only so much that it sounds "off"? You could render the project out with markers or regions and open the file in Sound Forge and use that app's time stretch function to correct any slight off-tempo errors. You could actually use what the KB article suggests and then use Sound Forge to force a particular tempo for a particular measure.

HTH,
Iacobus

Subject:RE: songs with varying tempo

Reply by: ATP

Date:8/1/2003 2:36:28 PM

the info you read assumes that you want to change the project tempo to match the wave file. in this case, whenever the wave file switches tempo, the project file will too, so it matches.

however, you want to do the opposite. you want the wave file to match the project file, effectively making the wave file even-tempo'd (is that a word?). i don't know how to do this easily. the only thing i can think of is cutting up the wave file in tiny loops and then put them in the project file one after another, so it tries to stretch all files evenly. dunno if that will work properly tho.