opmo 640 Posted December 20, 2014 To find out the midi ports setup of your system, please evaluate the (midi-destinations) function: (midi-destinations) => ((0 . "Bus 1") (1 . "Bus 2") (2 . "Bus 3") (3 . "Bus 4") (4 . "Bus 5") (5 . "Bus 6") (6 . "Bus 7") (7 . "Bus 8") (8 . "Bus 9") (9 . "Bus 10") (10 . "Bus 11") (11 . "Bus 12") (12 . "Bus 13") (13 . "Bus 14") (14 . "Bus 15") (15 . "Bus 16") (16 . "Session 1") (17 . "Keyboard") (18 . "MIDI OUT") (19 . "UM-ONE")) There are two possible ways to assign a port. One is with the port number and the other is with the port name (a string). (instrument :omn omn-form :port 0 :channel 1 :sound 'reaktor :program 1) now with a string: (instrument :omn omn-form :port "Bus 1" :channel 1 :sound 'reaktor :program 1 Share this post Link to post Share on other sites