from the top of my head...

Numeric Keypad...

1 - got to left indicator
2 - got to right indicator
/ - Cycle-loop
. - go to start (0.0.0.0 - begining of song)
* - Record
0 - stop
enter - start


I know there was an old topic with a chart u could print with all the shortcuts...

In Sx u can make yer own anyways, just go to file/ Keycommands... Nice& easy!

Z