Displax Connect Command Line gives you the possibility to set/get the Gain over the command line.
skin -gain
skin -gain {0-7} -ssave
Note: On the command line the value of the Gain is inverted. Meaning a “skin -gain 7” will be the same as a Gain “0” on the Displax Connect and a “skin -gain 0” will be the same as a Gain “7”.