Patent ID: 7365263

Claim:
An intonation training device comprising: a portable pocket-sized multimedia asset player into which has been downloaded information from which a pure chord corresponding to a specified musical key may be produced by the multimedia asset player; and code which when executed by the multimedia asset player causes the multimedia asset player to provide a user interface that includes a key specifier which the user employs to specify the musical key and a switch which the user uses to switch the multimedia asset player between an active state and an inactive state and causes the multimedia asset player to respond when the user employs the switch to switch the multimedia asset player into the active state by using the downloaded information to produce a sustained audio signal that is the pure chord of two or more simultaneously-sounded distinct pitches in a scale of the specified key and providing the sustained audio signal to the multimedia asset player's audio output, and remaining in the active state until the user again employs the switch to switch the multimedia asset player into the inactive state, whereupon the multimedia asset player responds by ceasing tot produce the sustained audio signal.