I use a VOX lil' looper for semi-professional use, and I had been considering buying DITTO 4x because it looked like a better version of my looper, especially when it comes to synchronized loops. I returned the DITTO 4x almost immediately, after I have realized how poor design they did at TC Electronic. First of all, temporarily pausing one of the 2 loops requires pushing twice very quickly the corresponding switch, which I've found very challenging especially while also playing. Second, when you start again the paused loop it starts over form the very beginning, which is so stupid if you have a song with a precise structure!!! It looks like a very well packaged toy to play in your bedroom, not for sure a looper for professional sessions. I'm happily back to my VOX lil' looper and associated external switch, appreciating even more its simplicity and its powerful features