A little progress:  When i select the bass clip, which is the entire length of the tune, and make sure it starts and ends at measure lines, all i need to do is go to the clips/groove clips inspector and check 'stretch' and it works fine for the bass track.
 
But the guitar track is different.  It has a bunch of clips stuck together.  It doesn't stretch with tempo changes, whether i bounce to clips first or not, and something else is weird - i can't crop the end clip to exactly a measure - it refuses to go to the end of a measure and instead goes just before or after.  Same for after i bounce to clips - it won't let me crop to the end of the measure... 
 
 

On the tracks that have many small clips try bouncing them to a new single track first. Select all of the clips on a track then use the 'bounce to track' command, selecting tracks as the source in the popup dialogue. Then try audiosnapping the new single clip track.

tenfoot
On the tracks that have many small clips try bouncing them to a new single track first. Select all of the clips on a track then use the 'bounce to track' command, selecting tracks as the source in the popup dialogue. Then try audios napping the new single clip track.

 
I Thought that was the answer too, but i get the same result - no stretching, even after mixing the guitar clips down.  Although i am doing the stretching in the bass clip (which does work) by simply going to the properties pane and selecting 'groove clip' and then checking 'stretch to tempo'.  so i am trying the same thing on the guitar track.

QuadCore
 
.  Same for after i bounce to clips - it won't let me crop to the end of the measure... 
 
 

Just to be clear Quadcore - did you 'bounce to clip' as you said or 'bounce to track'? They are very different.

As I mentioned earlier, in order to get correct results form Groove clip looping, you need to start by making sure the clip starts and ends on or very near a beat, and if it changes length by more than a beat, you need to check the Beats in Clip value in the Groove Clip section of the Clips tab in the Track Inspector, and set it to the correct value.
 
Enabling Clip Follows Project in the Audiosnap Palette should not immediately change the length of the clip unless the mode is something other than Autostretch, even if the tempo is not matched to the project, and no matter where the clips start and end or how long they are.
 
At this point, it might be helpful to know what's in the project, and how it was created. Is this all audio that you recorded into the project to a click? Or was it imported with or without matching the existing project tempo?
 
Regarding the snap problems, make sure the To/By switch in the Global snap module is set to To, and disable snap to Landmarks and Zerocrossings.

I'm with Brundlefly, Grooveclipping is the wrong (or way more complicated/involved) way of doing this. Using AudioSnap you can do it in just a handful of steps. Though for best audio quality you should bounce to clips which takes a little while.

tenfoot

QuadCore
 
.  Same for after i bounce to clips - it won't let me crop to the end of the measure... 
 
 

Just to be clear Quadcore - did you 'bounce to clip' as you said or 'bounce to track'? They are very different.

Yes, thanks tenfoot, i bounced to track - still had the same problem.

brundlefly
As I mentioned earlier, in order to get correct results form Groove clip looping, you need to start by making sure the clip starts and ends on or very near a beat, and if it changes length by more than a beat, you need to check the Beats in Clip value in the Groove Clip section of the Clips tab in the Track Inspector, and set it to the correct value.
 
Enabling Clip Follows Project in the Audiosnap Palette should not immediately change the length of the clip unless the mode is something other than Autostretch, even if the tempo is not matched to the project, and no matter where the clips start and end or how long they are.
 
At this point, it might be helpful to know what's in the project, and how it was created. Is this all audio that you recorded into the project to a click? Or was it imported with or without matching the existing project tempo?
 
Regarding the snap problems, make sure the To/By switch in the Global snap module is set to To, and disable snap to Landmarks and Zerocrossings.

Thanks, brundelfly.  It has a mix of audio and midi, all recorded to a click at the original tempo, to click reference or quantized midi drums.  I also made sure the 'to/by' was set to 'to' when cropping.

All I can tell you is that Groove Clip Looping is almost certainly going to be difficult to use in this way, and Audiosnap should be a breeze.
 
Do have the old Unified Tribe - Guilty demo project (from X1, IIRC)? It's all audio, and has a ton of variably sized vocal clips that don't all start and end on beats. As a sanity check, and to see for yourself how this all works, I would suggest you open up that project and execute the steps I described in post #13. I guarantee you will end up with all tracks playing back perfectly in sync and sounding pretty good.
 
Then try it with Groove Clip Looping. First, you'll will have to OK the warning dialogue about hidden material being discarded about 100 times - once for each clip - and the result will be a timing disaster, especially for the vocal tracks.

Post #13.  Ok, got it.  will try that out.  Thanks, brundlefly.