Amazon.com: TENEALAY 4-Way 3.5mm Stereo Audio Switch Input Signal Source Switcher Selector Splitter Box with line Volume Controller (4 in 1 Out / 1 in 4 Out) -MC41 : Electronics
Amazon.com: 3.5mm Audio Switch with line Volume Controller, 3 in 1 Out 1/8" aux switcher Splitter selector Box, Mini Inline Headphone attenuator Volume Control knob -MC31 : Electronics
Amazon.com: 2 in 1 Out 3.5mm Stereo Audio Switch Box, Audio Source Signal selector, 2 Way Speaker switcher : Electronics
Amazon.com: Professional 4-Way RCA Phono Line Level Stereo Audio Switcher Selector with 2 Selectable Outputs : Electronics
Premium 4 In 2 Out Audio Input Output Routing Switch Selector
FSR 4 x 1 Audio Switcher with Mic/Line Voice Mixer
2 IN 1 OUT RCA Audio Switch box, AUX Stereo Audio Signal source Switcher Selector with line volume controller Passive - AliExpress
4 Way Analog RCA LINE Audio Selector MIC Splitter Switch Box DB Panel Display | eBay