3.5mm Jack Audio Switch, 2 In 1 Out / 1 In 2 Out Audio Switcher Audio Selector with 3.5mm Audio Cable and Volume Control for PC Phone Laptop Headphone - Newegg.ca
DIY - 2 In / 2 Out Audio Switcher - YouTube
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Premium 3 in 1 Out RCA Switch Box, Passive Stereo Signal Source selector, Audio switcher Splitter Box (Black) on OnBuy