Matrix Mixer is a 4 x 4 matrix mixer, with a corresponding Mute button for each Input row and Output column.

Matrix Mixer is a 4 x 4 DC-coupled matrix mixer, which can be used with audio or CV signals. Each Input row and Output column has a corresponding Mute button. An LED indicates the Mute status - red for mute, green for active.

https://www.ottermods.com/matrix-mixer