Would it mean that I could have a flash, gun recoil and cannon sound all on the left stick
Right
Works with left stick and the k button. I bought one of these without the led, it had a problem where the relay would not open after firing sending current back to the motors. After numerous trys to find the problem I finally sent Tank modelbau an email. They had me send photo's of the board and soldering points and sent me a new unit which works perfectly.