Have an existing project established with purely MIDI jack setup (no USB).
Worked as expected.
Decided to experiment with USB MIDI connections.
Worked as expected.
Finished with that and returned to all MIDI Jack settings.
Experienced the following trouble:
A cell which calls a MIDI channel and Note value would perform the preview properly (hold encoder down and touch cell) but when running the sequence the cell would not activate.
Tried various delete, re-enter, different cell. Couldn’t find a solution.
Opened a new file, setup the MIDI Jack settings. No Problem.
The lesson: Don’t change between USB and MIDI Jack settings once a project file is established.