davec69:
Am I missing something? Is it possible to keep my H9 connected to my PC via the USB cable, and change patches via the Midi In jack?
The MIDI in jack and the USB port both connect to the same underlying thing, and you can't use both at the same time. Other users who've run into this problem have gotten around it by connecting H9 Control to the H9 via Bluetooth. If you're interested in that option, there's an FAQ item discussing which Bluetooth dongles have been known to work on Windows with the H9:
https://www.eventide.com/AudioDivision/Products/StompBoxes/H9_FAQ1.aspx#H9c3a
