Need flex time help, lots of songs, lots of BPM's multiple tempos

Question

Newbie here, trying to finally make the switch from Pro Tolls to Logic and flex time really sold me but I'm having some growing pains that I need to speed up for my current project.
I have about 20 songs that I need to:
first, find the bpm for each (quickly)
second, be able to mark them in a way that the bpm for each song would change to match the tempo track (which will fluctuate through out the editing process)
third, some how still have control of the anchor point in flex time which seems to get locked
In the end I am trying to create a remix of multiple songs that start off with different bpm's and fluctuating tempo.
I am able to do most of this but I think I am missing some steps, or perhaps the order of steps, that would make this process go much faster. I have worked other programs such as Ableton Live and elastic time in Pro Tools and at times it seems I can handle whole songs better in those programs than in Logic but I'm sure it more user error than the actual program.
I welcome any and all suggestions. Thanks.

Answer 1

Received this advice and responded on another forum but still need help.
Thanks for the response!
Had a few problems trying your suggestions.
*"Finding BPM: select the audio region and choose from the local Arrange area menu: Audio > Detect Tempo."*
Since it is a whole song and not just a part, such as drums, with well defined transients, it either can't detect the tempo or when it does it is wrong.
*"Make it follow the tempo track: Use Flex Time (in the track parameters, choose a Flex mode). "*
This would be fine if I didn't have to redefine all the transient markers as correct flex markers. Since Flex Time has problems defining the correct transient markers for complete songs it can be very time consuming.
Maybe I'm still missing something?
*"Third: what anchor? Do you mean the transient? Or the flex markers? You can move the transients in the Sample editor, and the Flex markers right on the track in Flex view (Click the Flex button in your toolbar)."*
The audio region anchor in the sample edit window, the orange arrow. I think this is some how turned off after turning on flex time and I am unable to move it. I use this to line up the first beat if there is something before the music starts, such as someone speaking or a lead in with a different tempo than the song tempo, that I would still like to keep. That way I can move the region in the arrange window and it will line up according to the first beat and not the beginning of the region. Am I making any sense?