Saturnworks Active 3-channel Guitar or Bass Mixer Pedal - Etsy
Mini Mixer - 4 Channels : Wounded Paw, Bass and Guitar Effects and Blenders
Active Guitar/Bass Signal Blender/Mixer Effects Pedal w/ Phase Switch | eBay
4 Channel Silent Switch Analog Mixer Pedal | Reverb
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Amazon.com: Line Mixer 4 Channel, Donner Low-Noise Mini Audio Mixer DC 12V with AC adapter & Stereo/Mono Adjustment, As Microphones, Guitars, Keyboards or Stage Sub Mixer, Ideal for Small Clubs or Bars :