What I mean, is that for sync'ing a field recording with a Caustic Project, you will have it using the click track here in LoopStack, setting up 8 measures for each recorded phrase, and saving the stems, you can bring into Caustic, match up the source recording tempo with Caustic's tempo, and your vocals or rhythm instruments will always stay on beat for each phrase that you load up into the app...
I thought I would just throw this out there, that LoopStack still can play a very useful role in Caustic "multi-track" efforts. 
I am not sure I understand what advantage you are describing as compared to recording directlyinto the audio editor, unless your saying it's just easier to trim the beginning/ end of the sample that way.
click track. I didn't think worked that way in Caustic itself....
@Jason, I do not think Loopstack could be useful to the cause in the current version (with mega failures). Before Rej should update it. In this regard, many Italians are asking why Loopstack was not updated since 2011. I think it has passed up because in the meantime there was Caustic.
LoopStack works just fine as it was designed (there are NO "mega failures"), and still is a viable tool for sketchpadding or other cool stuff that you can import into Caustic later...
It seems loopstack has been removed from the playstore...