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
Bi-directional 4-way Rca Stereo Audio Switch L/r Sound Channel Audio Switcher,2 In 4 Out Or 4 In 2 | Fruugo NO
Stereo MIDI switcher of 4 guitar effects loops and 4 amplifier channels
Kramer VS-4X Passive Stereo Switch – Thomann România