Problem with tempo, clock, through midi with external drum machine(Beatbuddy). A small inaccuracy in the looper trigger relative to the beat shifts the rhythm and can't be dialed back, the looper timing shifts relative to the drums and can't be straightened out.When I bought it, it was the intention to use the setup this way. If you "hit" it, it's ok, but you can't always count on it to work. Perhaps it's in the quantization adjustment? I hope the manufacturer tweaks it with some firmware upgrade. Otherwise, I'm happy. Robust, excellent switches. For control, one needs to buy a double switch to switch individual commands with one's feet and/or buy a midi switch, which would be ideal to take full advantage of all the functions when playing live and move more freely in song interpretation and not be tied to one loop. So in addition to the power supply, which is not, an additional investment is needed, which I hadn't originally counted on.