Need help with my Servonaut SMT module

[Supermario]

Hey all. If anyone can point me in the right direction with running a servonaut SMT would be great.
Manual is in German, I went to the site and unfortunately there is no English version available. The receiver leads are straight forward, throttle and horn. I connected power, speaker and the throttle lead. Green light on the board but no sound. Then I realized unlike a MFU that starts with power on , this thing needs some kind of proportional control to get it to start? What is the command? Is it cycling the horn or right stick vertical axis to start?

Anyway, like I said, any help would be greatly appreciated.

Mario