For guitarists looking to untether, the System 10 Stompbox from Audio-Technica is a great option. Super easy to use, it can lock with up to eight transmitters, so you can have a transmitter on each guitar and instantly switch — the receiver is smart enough to follow right along. No worries about channels or noise, and built like a tank, the System 10 Stompbox also has two switchable outputs for a tuner, two amps, or for an acoustic and an electric system. — Mitch Gallagher