Yes, you can easily do that.

  • Connect the AR’s MIDI out to the A4’s MIDI in port.
  • Go to AR’s MIDI Config>>Port Config and change Mute Dest to INT+EXT.
  • Make sure the A4 is set to input from MIDI or MIDI+USB.

Now when you mute channels 1-6 on the AR, the corresponding channel on the A4 will be muted as well.

EDIT: Just wanted to mention that it will also work the other way around (A4>>AR), but you’ll only be able to mute channels 1-6 on the AR this way.

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