Euphonycart Present Korg Digital Metronome In Ear Metronome IE1M. The In-EarMetronome is an ultra-small metronome that fits easily in your ear. Since you can hear the metronome sound directly in your ear without it being overpowered by sounds around you, it’s ideal for personal instrumental practice. You can choose from a variety of beat and rhythm variations, and while compact, it provides a full range of metronome functionality. Tempo can be adjusted smoothly using the jog switch, while a proprietary holding mechanism ensures that the In-EarMetronome remains firmly planted in your ear.