Compatible Products And How To Use 
You can use RMT with Underfacer and Isolator.
The Underfacer – Use a TRS cable to plug RMT into The Underfacer. With RMT you can access the mute and summing functions on The Underfacer remotely.
Isolator – Use a TRS cable to plug RMT into Isolator. Now you can remotely access the muting functions.
RMT overrides the mute and sum push buttons of The Underfacer and the mute push button of Isolator.
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Dimensions – 96mm L x 39mm W x 44mm H (including all jacks and switches).