just tested here again with my roland SC-88pro expander and the live arranger play correct.
Live arranger is not listed on Jack alsa, because is a windows application, but when is selected the serial port then must play on midi out too.

Make another test
Press the ASIO Midi PATCH 9 or 10, are the midi OUT patch:

This MUST play one external midi expander, IF this work, I think must work the live arranger too.