This is James from Mission Engineering. The release notes for H9 Firmware version 5.9.0 indicate Eventide have made some changes to the AUX switch detection code. It appears this maybe causing some incompatibility issues with the switch function in the Mission SP-H9. We are in contact with Eventide Support and will see if we can find a resolution. In the meantime, if you have a Mission SP-H9 and wish to use the AUX switch function, we recommend using the Direct Updater and reverting to firmware version 5.8.5 which does not have the incompatibility issue.
