You can use the U-24 Program Selector to: • Select any one of three turntables, or compare the sound quality of a cartridge on a turntable equipped with three tonearms. • Select one of two tuners, or change over between different stations on two tuners in a flash. • Record and play back tapes simultaneously on up to four tape decks, or duplicate tapes using four decks. • Listen to another program source (FM broadcast, record or tape) while you are duplicating tapes. • Select any of three power amplifiers. Please note, however, that you cannot use the U-24 Program Selector to select preamplifiers or speakers.