Korg has announced a new addition to its ever-popular guitar tuner range, the TMR-50, which combines a chromatic tuner and metronome with a built-in recorder that can tape up to 20 minutes of audio.

These are metronome sounds with four beats to the measure—for instance a time signature of 4/4, with stress here on the first beat. A metronome produces a pulse you can hear and/or see. It lays down a ...