Using Chordmachine, you can enter a chord progression, then play it back with your guitar. Left-handed and right-handed positions are shown exactly as you have to place them on the neck, both for practicing and learning. The demo version is save-disabled, and you can enter only eight chords. The full version has 64 chord entries, and you can save 40 compositions, and change or play them as often as you want. Remember to use the Control button to exit a tune.