Designed for mix monitoring, it facilitates operations such as reducing to mono, muting L/R speakers, isolating the side channel, the mids, and the low end. It also reduces the monitoring level by an adjustable range of -6 dB to -18 dB.

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This handy rack is meant to be put on your master channel. It's made for Live 11 users, but also includes a clone made for Live 9 onwards.