BOSS Dr. Beat Metronome with Rhythm Coach DB-90Practice in style with the flagship of the Dr. Beat Metronome line. The new DB 90 is loaded with quality sounds and drum patterns to make your practice sessions less mundane and more musical. Theres a Rhythm Coach function with an onboard mic, a reference tone function for tuning, an Instrument input, MIDI input, and other handy tools to make learning fun and effective. The most advanced metronome available Trigger input to access unique Rhythm Coach