Possible Clues:

• Band take album to engineer from Queen with sound system perhaps
• Equipment to make rap electronic disc with Queen
• Device used in some interviews ( 2 words)
• Device to preserve sound
• Machine for preserving sounds on cassette
• It's played to fool people into thinking that someone's talking in a room
• It's played to fool people into thinking that someone's calling them (as in 'Manhattan Murder Mystery')
• Device for reproducing sound
• Bell lab patent of 1886
• End sharply with E-chord resonating � the essence of stereo for analogue audio equipment