Implement "Relax" function of Kentech driver.
See post from Bryn Perry:
Relax is something we requested be implemented at firmware level in the Kentech driver. The relax function cycles all outputs through a diminishing sequence of sinusoidal voltage waves, from +Vmax, to -Vmax, then +Vmax/2 to Vmax/2, etc in order to combat hysteresis. This was something Chris previously came up with and is a feature in our ancient home-made software. I believe that Jonas saw a definite difference when using it during the mirror characterisation. To start with he was triggering it with a command over HyperTerminal, but decided it would save time to add it to the software. He hacked it in at the time, but said he would do so properly later.