Thanks John, I did come across some projects using an Arduino. Although the Arduino for timings, etc but still require the signal (PWM) line. Anyway I have downloaded the ino file for later play. The gear I have needs the motor polarity reversing for up or down. Looking at a stripped down image of one these jet jockey controllers it looks like they use our old friend the STM8 chip (found in receivers, speed controllers, "you-name-it" and the motor control forward/reverse is switched by small chips but could not see in the photos what they were. Think they are LB11805 maybe.