Related Clues:

• Sound engineer's device
• Soap brand named for its 'Round the Clock' protection
• Audio mixer knob
• Old TV dial
• TV fixture of old
• Start a call, anachronistically
• Television tuner of old
• One making a pitch?
• Bygone phone feature
• "Friends Don't Let Friends ___ Drunk" Plain White T's
• Mogwai song about guitar helper?
• Replacements "Left of the ___"
• Spinet servicer
• Part of a gauge
• Pitch-checking gadget