The wave will be short and rapid on a tank of only 2 ft in length, the speed will have to be almost all the way counterclockwise. The wave height and frequency is mostly a function of tank length and a short tank will not produce a big wave. The slave and master cables perform the same function, I can replace the master cable though or if you are comfortable withe soldering I can send a new cable. 3 wires are connected to the board.