Hello - don't now about exusing me or as it is useable in this forum, but I'm one of these ""Fools" that drives the FXS "in loyality".  ;) ;)
Bought the "BUFF" a few days ago and looked for instructions to start up the engines in a way that they will not only idle rather "produce" thrust.
I tried many things about fuel valves, electricity, battery - here are some videos on you tube - but the engines only idle, making a sound, they would start again, again and again.
The eight Tacho show idle-speed - and nothing else if moving the thrust levers.

Thank you for valuable tips. Thanks in advance.
Andy