Th3 has a looper but it isn't great. It is possible to have clicks at the end if the loop and it doesn't do real time stretching so the timing of the loop depends on the person stomping the pedal. It does work and you can use it to loop synth output or audio. I have never looped midi input but there are midi delays.
When I want to loop, I usually use my old boss pedal.
There are other apps that are good for real time looping. Sonar ain't it.
There is input quantize. This means if you loop record a drum section you can slowly build up the midi clip with tightly timed drum funkiness.