Sorry about that. Too hasty a reply. Try this:
- No fades on the multi itself.
- Keep the multi Async.
- Set the loop region to the exact length of the loop minus the crossfade length you want.
- Keep the multi slightly shorter than the loop.
- With the multi selected, right click the Volume knob in the deck (bottom left) > Add Modulation > AHDSR.
- Set the attack and release to the desired length of the crossfade, and push those curves up to keep equal power.