Using PC Windows 10 with Cubase Pro 12,
I have defined a new instrument in the Midi Device Manager (with “Preset Reference”).
When defining a patch under “patch banks”,
I use a custom sysex string before the actual Program change.
Selecting that patch in channel inspector, result in no midi messages is sent by the interface(Midex 8, M8UXL).
If I’m leaving out the sysex string, it works and PC is sent.
The sysex string is confirmed to work, when adressed to a button on the device panel.