Digital Guitar Tuner is a free Windows software, which let's you accurately tune your guitar using direct input, microphone or MIDI tones. Now a new version 2.3 is available for downloading. Now it features 27 tuning types! Features: * High accuracy (uses 16 bit / 44100 Hz input!) * You can tune guitars with no signal output (through microphone) * 27 different tuning types (standard, lowered, dropped, open tunings, Hawaiian etc.) * Modulation of root frequency * Tuning with midi tones * Nice and simple environment * it's free!