No software, just deduction from what we've all seen.
Look:
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Here it's pretty clear that there are 3 pairs of jacks, and they're definitely grouped in pairs cuz there's a label centered between two jacks, a horizontal line below and then 2 labels, one above each jack (the labels on the left pair are partially covered by a cable in this pic). The labels below the line in the first two pairs are a longer one for the left jack and a single letter for the right jack, on the third pair both are a single letter/number.
Now, do you have some other possible hypothesis over what they could be labeled other than this?
INPUT | OUTPUT | PEDAL |
____________________________ | ____________________________ | ____________________________ |
L/MONO . . . . . . . . . . . . R | L/MONO . . . . . . . . . . . . R | 1 . . . . . . . . . . . . . 2 |
From this other pic it's pretty clear that the third pair is for exp pedal cuz the cable from there goes straight to the expression pedal
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