Reply To: H9 aux switch + expression pedal

[nickrose]

There are some software problems making this difficult. Apologies. These are fixed in the next release, due in a month or two.

You will need an "insert type" Y-cable, with a stereo jack going to two mono jacks. The tip of the stereo needs to go to the pedal, while the ring goes to the switch. Example from Amazon:

Hosa Cable STP203 TRS To Dual 1/4 Inch Insert Cable – 9.75 Foot  ($1.99)