Beat Metronome features Rhythm Coach functions with an onboard microphone, a reference-tone function for tuning, an instrument input, MIDI input, and other handy tools. The Boss DB-90's note mixing function allows you to instantly create a variety of beats by adjusting the levels of 5 different note values. Front-panel sliders, buttons, and a large rotary dial provide instant, hands-on access to edit parameters. Select 4 different click sounds, plus a human voice-counting sound that will help you know your place in the bar. The DB-90 is also equipped with realistic PCM drum patterns, for developing your accuracy and rhythmic feel effectively. Create different beats to accompany your practice. The Note Mixing function allows you to instantly create a variety of beats by adjusting the levels of five different note values.