Zoom FRC-8

The Zoom F-Control is an essential piece of gear for everyone who uses an F8 or F4 Multitrack Field Recorder. With F-Control, you can have total command of your recording experience.

F-Control is a mixing control surface that gives filmmakers more control and flexibility when recording in the field. It works alongside the Zoom F8 and F4 to create a complete and professional on-location audio rig.

https://www.zoom-na.com/products/field-video-recording/field-recording/frc-8-f-series-remote-controller

https://www.youtube.com/watch?v=gQ_Aw1ftd4o