Related Clues:

• Home entertainment letters
• Water bearer?
• Test-driver's car
• Channel
• What a test driver test-drives
• Airpipe, e.g.
• Music sampler
• Cable conduit
• Tear carrier
• Band sample
• Way in or out
• Pipe up or down?
• Garage band's tape
• Audition tape
• Sales pitch enclosure, maybe