No idea. As far as I know, from the manual received and from a short email interchange with Mike (which never commented my suggestions -among which also a midi sync) I would say no.
Something which I really really really really really really miss in the Rang is a "pause" function.
I can only play or stop a loop. So, in Sync mode, if I stop a loop then when I restart it it must wait the master loop to start from the beginning, which I guess is why Mike says that it is better to have a short master. THe problem is worse when I stop loop 3, then supposing I have number 2 and 1 playing, and I stop 1, then if I want to restart 1 or 3 they must wait the 2 to begins again (and if 2 is long, that is very annoying).
My idea is that it should be possible to pause (or MUTE) one or all loops, so that they keep playing but no sound comes out, and when you unmute them, they are still perfectly synced.
THis is very cool for lot of things which maybe some of you do not use, but I use the looper mostly to do things like Bauchklang (ook for them in youtube and soundcloud), a beatbox band which make techno electro music live, just with the voice. I LOVE THEM, and it is two times that I have the honour to jam with them on stage during their concerts here. I can't beatbox like them but I can sing overtones quite well and the pubblic get crazy. :)
So, for that kind of music, it is important the speed of pause/restart.
Maybe one day I will need other tools.
Now I am poor and unsatisfied with my job, so, I must go ahead with what I have.
