New Line 6 Relay G10S Digital Guitar Wireless System with G10TII Transmitter J Mascis Ram's Head Big Muff Pi and a unique quantized hard-sync

and a unique quantized hard-sync vibrato effect

Turn counterclockwise to sweep the corner frequency and increase the filtering

Middle - Controls the mid frequencies level

From Keeley:

When you go minimalist

New Line 6 Relay G10S Digital Guitar Wireless System with G10TII Transmitter J Mascis Ram's Head Big Muff Pi and a unique quantized hard-syncThis item is new, in box! A Stompbox Plug and Play Guitar Wireless System The Relay G10S is a compact instrument wireless system that frees guitarists and bassists to move around the stage untethered. A member of the Relay Wireless family of products that are renowned for their reliability, the Relay G10S wireless system features a rugged metal stompbox receiver that easily integrates into a pedalboard, as well as simple plug and play operation.