i don't use reason, so i don't really know the in's and out's of using samples in it. could you explain what you mean my 'looped sampling'? i guess you're talking about using the Dr.Rex sampler in reason? i didn't realize that it could only take .rex files...
call me old school, or just plain old

, but i don't really like all these soft synths, and stuff like reason. i say, if you want MPC quality, use an MPC. i don't really like using software to sample, i usually use my akai s2000, since it's faster for me to find loop points by hand using the 2-line LCD than it is for me to learn how to use some software.
but i will tell you this: i got recycle a year ago, and that's a damn cool program! the whole idea of recycling loops is amazing. what i used to do was to sample in my s2000, find loop points, match the tempo of my song to the sample, calculate the timestretch, assign midi notes to the samples, record midi into protools. with recycle, i can still find loop points manually in my s2000, but i don't have to. with the sampler connected to the mac, i can import the sample into recycle, find the loop points there, recycle slices the beat up, sends the sample (as a program, with midi notes assigned to each slice) back to the sampler, and creates a midi file of the sliced loop. all i do is drop the midi file into protools; i can change the tempo in protools, and the sampled loop changes right along with it.
i don't know if any of this helped you. all i can say is, try out recycle.
http://www.propellerheads.se/downloads/demos/main.html
i know it sucks plunking down more money for software, but if you do a lot of sampling, this might be the answer. and it would help with using your loops in reason.
tr