Check the listing for details. Korg Gm-1 In-Ear Metronome Black (2-Pack). Color: see description, Condition: New. Listed at 101.51 USD. The GM-1 is an ultra-compact metronome that is worn like a traditional earphone. When using multiple GM-1s, the sync function ensures the perfect tempo adjustment. This makes the GM-1 particularly suitable for rehearsals of marching bands, dance groups and ensembles where the actors have to move. The receiver adapts to the ear canal and has a tight fit. This means you can hear the metronome signal clearly even in a noisy environment. All of our items have a 30-day return policy without explanation. Notes, reading and software are excluded from the exchange. The General Terms and Conditions of Zoundhouse GmbH & Co. KG apply. When purchasing multiple items: Add the items to your shopping cart and select “Request total from buyer” at the top right. If you intend to buy multiple items: put the.