I found the instructions for the Looper somewhere on GT's site but I'll be darned if I can find them again. I did write them out when I originally found them -

Keyboard Shortcuts

a - looper tag to start of required section.

b - tag to end of required section.

Left cursor - skip back 10 seconds.

Right cursor - skip forward 10 seconds.

r - toggle the looping (on - off, on - off)

x - re-set looper start & end points.