Looking inside the enclosure from the back, the left footswitch is standard 3PDT wiring.
Right footswitch wiring is as follows:
If you plan to use an expression jack, wire the R/T/S pads at the top to the corresponding Ring / Tip / Sleeve lugs of the exp jack.
Wire the unlabeled pad just below the pad marked T to the Switched Tip lug of the exp jack.
If you do not plan to use an expression jack, install a jumper between the T and unlabeled pad.
Looking at the knobs the controls are:
First Order | Spectrum | Second Order
Color | Regeneration | Dispersion