Jim:
I do this by aligning the Tempo Map of the project to the recorded audio performance and it's fairly straight forward.
I'm making the assumption that each song is in it's own project (as you indicate you already do).
An overview of what I do is:
- Prep the project settings for Tempo Map alignment
- Align all tracks to start at 1:01:000
- Align the tempo map of the project to the actual performance
To prep the project settings for Tempo Map alignment I do the following:
- Turn off "Snap to Grid"
- Ensure the tempo map only has one entry (doesn't really matter what it is at this point)
- Ensure the Meter/Key Signature is set to the proper Meter at measure 1:01:000
- Ensure that "Replace Old with New" is selected in Drag and Drop options
- Ensure each track only has one big clip in it (select all the tracks and their clips and bounce to clips if you need to)
Here's how I align all the tracks to start at 1:01:000:
- Set the "Now Time" as close to where you think measure 1:1:000 should be in the audio (you'll probably have to listen to the song a couple of times to figure out where 1:01:000 should be)
- Select all the tracks and clips in the project
- Split all the clips in all tracks where you have set the "Now Time"
- In all the tracks, select and delete all the newly created clips to the left of where you think 1:01:000 should be
- Slide all the remaining clips in all tracks to start at 1:01:000 on the timeline
- Once you've done the above, all your tracks will have the audio 1st beat starting at the project timeline at 1:01:000.
Here's how I align the tempo map of the project to actual performance:
- Play the song and listen to where the 2:01:000 should be. (I find the "Scrub Tool" along with "Aim Assist" is useful for this.)
- Position the "Now Time" to where you think 2:01:000 should be and press Ctrl-M to bring up the Measure Beat/Meter dialog.
- Ensure that the Measure input box has "2" in it, and the Beat input box has 1.000 in it and press OK. You will note that the project timeline now indicates that 2:01:000 is at the "Now Time".
- Perform these alignment steps for each measure through the entire song. (I sometime have to use the Measure Beat/Meter dialog on beats other than x:01:000 if there is a significant decelerando or accelerando in the song that needs to be tracked.)
- Once you done these alignment steps, your Tempo Map should be aligned quite nicely with each measure in the audio.
Once you've aligned the Tempo Map, you can then use the other tools to "tighten up" the timing, or add MIDI based sound reinforcement. You can even make the tempo more consistent by setting all the clips to follow the project tempo from the AudioSnap pallette and modifying the tempo map to remove variations in tempo where desired.
I hope this is applicable to what you are trying to accomplish,
Paul