Filming is not so easy (3 hands!?) - I´ll try later.
I observed, that after choosing "Echo Trainer" - "File Player" function request "Press paddle" pressing the paddle does NOT work with straight key; I have to press black button once.
Tried again with sequence "hcc". Display shows "h" and immediately shows ERROR - before entering next character !?

73 Wolfgang
It´s correct, I am absolutely not perfect, but try hard ;-)