jack_midi_latency_test -V (return code: -11)
jack_midi_latency_test: invalid option -- 'v'
jack_midi_latency_test --help (return code: 0)
Usage: jack_midi_latency_test [options] [out-port-name in-port-name]
-h, --help print program usage
-m, --message-size=size set size of MIDI messages to send (default: 3)
-s, --samples=n number of MIDI messages to send (default: 1024)
-t, --timeout=seconds message timeout (default: 5)