Music can be used without royalty payment if it is in the

The is the heart of the sound system.

Cassettes, , and are used to play sounds.

The balances high, medium, and low sound frequencies.

The provides the power supply to the speakers.

are used to amplify sound.

With digital you can use a computer to help you mix sounds.

The body, or , mic can be hidden on the performer.

The sends a signal to a receiver unit on the soundboard.

The system is separate from the main sound system.