Check the listing for details. Studiomaster IMP 1 Inline Mute Professional Processor. Condition: Used, Made in United Kingdom. Listed at 74.99 USD. This unit works properly. nice overall condition. Comes with build in power cord. The Studiomaster IMP1 is a vintage rack-mount Inline Mute Processor designed to automatically mute audio signals. Key features and details include: Functionality: Used to automatically mute signals, often connected to the insert stage of a Studiomaster mixing desk. I/O: Features 16 unbalanced jack inputs and 16 unbalanced jack (tip/sleeve) outputs. MIDI: Equipped with MIDI In, Out, and Thru functionality. Expansion: Includes EXP IN and EXP OUT 5-pin sockets, likely for chaining multiple units together. This unit appears to be from an older era of Studiomaster equipment, focusing on analog signal management for studio or live setups.