mission
Inspired
According to the manual, the MIDI Mate can pnly accept one expression pedal or switch, so the other will have to connect to the Ax-Fx directly.
Yep. This is the way to do it. The Rocktron products including the MIDI Mate use reverse polarity, so connect OUT 1 (the pedal out)on your SP1-R to the MIDI Mate with a TRS - TRS 1/4" cable and switch the polarity switch on the SP1-R to the reverse position (switch toggle forward). Connect OUT 2 (the switch out) to the input on the back of the Axe-Fx. Mission.