DP48MUTE FUNCTION

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Hi there! My name is Thanos and I'm a sound enginieer-designer and I'm using the midas DP48 personal monitor for three months now and I'm satisfied. The problem is that the musicians need the mute function sometimes because I'm changing the inputs from the midas DL32 stagebox or I'm changing the instruments. Everytime I warn them to turn off the master volume because the mute function does not exist. Is there something better than this??? Is it available a firmware update with the mute function???