SOLVED !
Message form facebook BTT group
PG19 is definitely a GPIO pin. It may not be on the 40 pin GPIO header but any input / output pin on the BTT Pi and CB1 is GPIO.
The formula to convert from PG19 to GPIO is:
[(PG - PA)*32] + {Pin Number}
Where PA = 1, PB =2….so PG = 7
So [(7-1)*32] + 19 = 211
Try using GPIO211
The BTT documentation on this is rubbish and lacking.
result :
Thanks again and happy FAST printing
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Push on GitHub with more explanation.