Low Gain Electronics - 4X4 Passive Matrix Mixer

Audio feedback mixing & CV modulation routing

I/O: 4 Input 4 outputs
Available in either Banana, 1/4" OR 1/8" (3.5mm) Jacks!
Power: No Power Required
Size: 5.72" x 4.77" x 1.39"

https://www.low-gain.com/shop/p/4x4matrixmixer