i have owned a number of loopers over the years, my favorite, that i foolishly sold several years ago, was a boomerang III. now i'm looking again at loopers and trying to decide what to buy. another rang? pigtronix infinity? chain a couple of jamman xt expresses together? or a ditto x4? basically i want a looper that'll do a couple of things play more than 1 loop at the same time in either synced or unsynced mode give me the flexibility to adjust the volume on each of the loops independently fade out on paper, i think the ditto x4 would give me what i'm after.. but i have read a number of complaints online about issues with firmware and the units locking up and loops that are not seamless, and on and on. my question to x4 owners is, are you happy with the x4? are the complaints founded? have the issues been resolved by TC ?