MIDI demonstration

midi-demo.xtc is an original MIT-licensed metadata-only example based on the repository v10 fixture. It contains one A4 MIDI note, a gain node and an output. Open it in xtc and Play after connecting JACK output ports to hear it. It needs no media or plugins. xtc-check --validate midi-demo.xtc works without JACK. Save a working copy in your own folder; installed examples may be read-only.