1. Install Eventide H9 Control software on OS X.
2. Update the H9 to the latest firmware.
3. Configure the H9 software for a Mission SP-H9 expression pedal.
We are using Mac OSX in this example, but the process for installing the software is similar for PC. There is also an iOS version available.
You can download all versions of the software from https://www.eventideaudio.com/support/downloads