The Korg KDM series is known for its powerful volume and distinctly audible tone. The KDM-3 model features an attractive design reminiscent of a mechanical miniature metronome, along with a variety of beat patterns and metronome sounds. It is also packed with practical features expected from a digital unit, supporting performance in any situation, regardless of genre or instrument.

The KDM-3 offers the sound of an acoustic-mechanical metronome. Users can also select alternative sounds that match their performance or instrument, including cowbell, rimshot, or voice. All these sounds deliver a clear tone that is easy to hear and will not be drowned out by high-volume instruments.

In addition to 0-9 beats per measure with options for duplets, triplets, triplets without the middle note, sixteenth notes, and sixteenth notes without the middle notes, it has variations like Son Clave and Rumba Clave for a total of 19 built-in beat patterns. The tempo can be freely selected within a range of 30 to 252 beats per minute. From classical to pop, jazz, and Latin, this unit meets the needs across a variety of genres.

The start/stop button on the top of the device blinks in two colors, red and green, providing a clear visual indication of the tempo. You can begin practicing when the volume is set to zero. The tempo/calibration knob on the top allows easy access to the desired setting. The content of the setting is clearly visible at a glance on the large display.

The sound out mode generates a reference tone through the built-in speaker or connected headphones, allowing users to tune by ear. It can produce 12 reference tones in the range of C4 to B4. The calibration of the A4 pitch can also be adjusted over a wide range from 410 Hz to 480 Hz.