Boss DB-90 Dr. Beat Drum MetronomeThe BOSS DB 90 metronome packs an astounding number of functions and features into its compact, lightweight chassis. You get four great metronome sounds (including human voice) plus dozens of drum patterns to accompany your playing. Easily customize rhythms with the Note Mixing function for great variety. Use the built in mic, MIDI input, and direct guitar input onboard the DB 90 for all types of practice sessions, or plug in your Roland V Pad and