It depends if your audio file was recorded to a steady click or it was simply a live recording. A live recording might sound to you like it's a steady tempo but if you play the file and start a metronome at the same time you'll hear lots of tempo variations. Generally most just assume the tempo could wander a bit so you're better off to set it per bar.

When you generate an RT which is also an audio file it's tempo is perfect because you set the tempo in the program before you generated but, if your audio file is from somebody else's recording and you don't know how it was made then you should set the ACW manually.

Bob


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