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Hi Yosuke

are the channels you are using in a Stereo configuration? Or are these channels ganged together with the mute function linked? Or ist it possible you have mapped the same function to 2 PL-10 buttons?

If not

Please contact A&H Technical Support who will be able to help resolve your issue.

Please include a show file and information on exactly how you have your system connected and setup.

Sam A&H