Cally man is right. There is no need for an „looping“ button. You can start with an „call“, signal or Intro and your main part of your Rhythm will loop, when you set it between this signs: :

Loop is running til you press the stop button.

Then is playing the outro or Signal

I think a repeat from the : marks with the option of repeat numbers of times or loop, and completed track loop with repeats. The same like sheet music