Heads up: The OI will output 127 for what it perseves as infinate resistance. I'm not sure of the exact threshold, but my theory is that when volts <= 0.1, it outputs 127. But noise (flickers between 0 and 127) goes until about 0.110 or 0.115.
So if, as an example, you wire a potentiometer to p4_aux, when the pot. is all the way down, p4_aux=127. when it's a little higher, p4_aux=0.
also, 127 appears in it's "normal" position (midway 'round). So you can't just put in an if statement.
I hear this is by design. So watch out!