Hi. There is a VST you can download for free from KVR audio. It's a plugin called Mobius. It's a free VST looper with "extensive midi control" (to quote the website). I downloaded it once and never used it as I have two looper pedals. (I would recommend getting a loop pedal as I haven't had much success with software loopers.) Well, 3 once you include the one in my multi-fx. Personally I like to work the other way - use the instruments in S1 and then routing one of my outputs to the looper, loop my atom beats via the pedal. The advantage of a pedal is you get to send the building of the loop into studio one as you record your performance. However, I prefer hardware over software for lots of options.