Without media-libs/portmidi installed, playback fails. It is enough to add it to the dependencies (maybe behind a "+midi" use flag?). Reproducible: Always Steps to Reproduce: 1. Install frescobaldi and ensure that portmidi is not installed 2. Start a midi synth (e.g. fluidsynth via qsynth) 3. Try to play something Actual Results: Frescobaldi complains about missing portmidi libraries. Expected Results: Playback should start.