I am trying to sync the timeline to the rhythm of an analog recording, so I can remix and replace drum hits.
 
Audiosnap detects transients of a rhythmically complex piece.  Most of them are in the wrong place.  But I still need to sync the piece to the timeline.  So as the track plays, I have tapped markers on each 2 and 4 snare hits.  
 
Should I delete all the extra transients that don't align with my markers?  And once I have manually edited the transients, how do I get the timeline to sync to that?
 
 

I think I'm figuring it out.  For this project I need to tap record a midi track that I can then use for the project tempo.  Not markers, that is the way another program does this.
 
 

You also might find this helpful: http://forum.cakewalk.com/How-To-Beat-Match-Using-AudioSnap-m3056749.aspx
AudioSnap is not easy. It took me quite a while to get to know it well enough to get consistent and useful results.

Anderton
You also might find this helpful: 
AudioSnap is not easy. It took me quite a while to get to know it well enough to get consistent and useful results.

Thanks.  This is a typical use case for me; starting with a recorded track and then rebuilding it with midi.  Its nice to get the original timing of the drummer as opposed to just picking a tempo or trying to use tempo changes in the timeline.

And depending on how many drum parts your replacing. I normally do the kick only.  Tried a few times but like Craig said, it a bit of a grunt to make audio snap do what you want it to do. I have been successful 50/50 with it. 
The tracks have to have very little leakage. 
One trick for the kick was to filter it to the dominate frequency ( 300-500) put a steep notch on it and get rid of the rest. This really perks up the transient markers with fewer false triggers.  Then have audio snap generate the midi track. 
As I said you don't really need a tempo to replace drums with midi. 
Only difference is you'll be correcting timing by ear instead of the grid. 
Snare is hard because of the wide dynamic range that could be used in rolls and fills. OK for just a boring 4/4 pattern but it misses all those cool things a real drummer adds so there's no point. Might as well bash it out on a keyboard. 

Cactus Music
And depending on how many drum parts your replacing. I normally do the kick only.  Tried a few times but like Craig said, it a bit of a grunt to make audio snap do what you want it to do. I have been successful 50/50 with it. 
The tracks have to have very little leakage. 
One trick for the kick was to filter it to the dominate frequency ( 300-500) put a steep notch on it and get rid of the rest. This really perks up the transient markers with fewer false triggers.  Then have audio snap generate the midi track. 
As I said you don't really need a tempo to replace drums with midi. 
Only difference is you'll be correcting timing by ear instead of the grid. 
Snare is hard because of the wide dynamic range that could be used in rolls and fills. OK for just a boring 4/4 pattern but it misses all those cool things a real drummer adds so there's no point. Might as well bash it out on a keyboard. 

The track I am doing now doesnt have a consistent kick on 1, so that wont work, but the idea of using a filter to help audiosnap is something I will try.