jvmetro: jvmetro (Jack Visual Metronome) jvmetro: jvmetro: JVMetro provides a colorful, realtime visual indication of jvmetro: the passage of bars and beats on the Jack transport; jvmetro: without generating any sound of its own. jvmetro: jvmetro: For simplicity, SDL is used to generate graphics. jvmetro: jvmetro: jvmetro: jvmetro: