A variable level output control and the ability to handle line, musical instrument pickup, dynamic mic AND phono input signals makes this little item very handy indeed. This is an excellent front end for sound reinforcement applications that don't require the complexity of a mixer but may have to handle various source and output level requirements from job to job. DJs and roadies will benefit from having one of these in their tool box to take the place of larger, more expensive equipment in a pinch. PLUS the TC-740A adds a rear-panel attenuator switch to allow use with higher level line sources which exceed the TC-740's input capabilities, such as CD players, tape decks and MP3 players.