Essentially, the channel Mute/Cue buttons mute the channel signal from the main combine and feed it instead to the Cue buss, a lot in the manner of a Solo system.
And it could offer so much greater than the Oasys. http://orbit3D.com/__media__/js/netsoltrademark.php?d=Xn--L3Ca4B8EPB5B.com%2Fcategory%2F%25E0%25B8%2584%25E0%25B8%25A5%25E0%25B8%25B4%25E0%25B8%259B%25E0%25B8%25AB%25E0%25B8%25A5%25E0%25B8%25B8%25E0%25B8%2594%2F