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GrandOrgue expression problem


HI, I am new to this forum. I am working on my VPO. I am using Hauptwerk and GrandOrgue. Hauptwerk works flawlessly but I am having trouble with GrandOrgue. The keys and pedals play fine. The problem is with the Expression shoes and Crescendo shoe. I can't get GrandOrgue to recognize them I tried all the setting that I can think of. I am using Arduino's and also a light dependent resistor. I have also tried a photometer but I can't get the expression or Crescendo to work with that either. Any help would be grateful. I tried two different sets.


In the code I was using there was line that read:
Serial.write (0); //number zero
and it should have read
Serial.write (0x07); //number zero

it was listed under the expression part of the code.