Step-by-step process
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Open Razer Synapse.
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Click on your mouse under “DEVICES”.

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Go to the “CUSTOMIZE” tab.
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Click on the buttons to program with the Multimedia Controls.

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Click on “MULTIMEDIA”.

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Open the dropdown box and select which control option you wish to program.

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Click “SAVE”.

The programmed button will appear as the name of the control you programmed to it.
