MR18 Mute behavior


I think most mixers allow you to mute a channel in an Aux bus independent of the main mix.  The MR18 seems to have it's mutes coupled together.  When the mute button is used in either the main or aux busses (with the exception of the master slider of either), it carries that change through all of the buses.  Is there anyway to decouple this feature and have independent control of the mute function?  I understand that muting on the main mix layer should carry through to all aux mixes.  But sometimes, we need to mute a channel on an aux bus without having it mute the same channel on the main bus.  Suggestions? Thanks!