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From Zoom:

New type of compact multi-effect device designed for creating great acoustic guitar sound. • Suitable for use with an acoustic guitar or an electric guitar. Use the dedicated effects for acoustic guitar, or make an electric guitar sound like an acoustic guitar with the built-in simulator. • Unique AIR effect imitates the sound as picked up by a microphone. Reverb and chorus effects help to create a spacious feeling. Enjoy life-like, dynamic sound even during line recording. • Feedback suppressor automatically detects and attenuates problem frequencies. This makes the 504 useful not only for line recording but also on stage. • Two input jacks with different sensitivity allow optimum matching to any type of guitar, from acoustic guitars with magnetic pickups to electric guitars with humbucking type pickups. • You can switch between 24 patches to store diverse settings based on your preference. • Integrated auto-chromatic tuner for guitar. You can tune your instrument easily anywhere, any time. You can also leave the tuning function disabled all the time. • Dual power supply design allows the unit to be powered from a 9V alkaline battery (6LR61) or an AC adapter.