Heureka, it works!
a little bit of adjustment to my initial idea, but now it's satisfying:
pt 07 e7 0F 0F 01
PT: passthrough
07: extended command
e7: e=house B, meaning of 7 is unknown
0F: meaning of 0 is unknown, F = unit 10
0F: Position 15, little bit below the middle
01: Codetype for shutter codes
only thing that could be difficult now is implement this in a slider, as the ${param} is giving decimal values, and mochad/X10 is expecting hexadecimals...
but will try it anyway
thanks dhouston for making me read the document over and over again today, otherwise I would have discarded it as too complicated
and congrats to mmauka for developing such a fine thing like mochad, very pleased with it's possibilities!
regards
Doogie