I compiled it successfully for jack. Thanks for fixing this! Now I can select "external" MIDI input and play in a series of notes. They come in two at a time and this is latency. Does not make much sense. I cannot play chords into the program. KB interface -> a2jmidi_bridge (alsa pane) a2jmidi_bridge -> denemo (midi pane) The denemo "device" only appears after selecting external MIDI and then one must connect it. This makes little sense. I tried to play back: Started timidity. Connected timidy -> system. (audio pane) There was no denemo "output device" presented on the midi or alsa panes. Did not playback with F5. Timidity may not be correctly configured in the script I used to start it (it worked a long time ago) so maybe not denemo's problem right now. However, a "silent" playback with the cursor following the notes might have been expected anyway. As I said, a direct alsa playback to the sound generator would take far less cpu than timidity and work better.