Line 6 exp pedal voltage range

[Gtr_tech]

Have a Line 6 FVB Express floor pedal controller in for rehab. The phototransistor on the exp pedal failed, closest thing I could dig up with what I have on hand was the detector half of a slot opto interruptor. Seems to work ok (haven't tested it on the amp...I don't know how to work the freakin' thing) but the voltage range I get on the output side of the photo x-istor is 1.3-2.55vdc sweeping the pedal to both extremes. Anyone fooled with these? Voltage close enough?

[Gtr_tech]

COrrection.....the low end of the range should be .3vdc. My worklamp was throwing it off. It seems to operate as it should....had to d/l the damn manual on the amp to figure out how to assign the pedal.