DigiTech Midi Implementation Manual page 81

Foot switch function table
17 byte table for unique foot switch combinations. The value of a byte in
this table has the following definition:
0 No Function
1 Program Up
2 Program Down
3 Parameter Up
4 Parameter Down
5 Parameter Right
6 Parameter Left
7 Compare
8 Store
9 Name
10 Utility
11 Bypass
12 Repeat Hold
13 Select Program, use corresponding byte in the foot switch program table.
Foot switch program table
17 Byte table that contains the program number to be selected when a foot
switch is configured to Select Program.
LCD contrast value
0 (00h) LCD Contrast 1
16 (10h) LCD Contrast 2
32 (20h) LCD Contrast 3