Stereo Audio (420-2110) Features Faxback Doc. # 6798 Source Selector The Radio Shack Audio Source Selector lets you connect as many as three line-level audio sources to the single auxiliary input of your stereo receiver/amplifier. You can connect a CD player, VCR, cassette tape player, or other audio sources to your receiver/amplifier and select any of these source for play without exchanging cables. (LB/all-07/11/94)