Cooler Master Reaper - Manual (Page 17)

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The left window is your stored macro database in the Reaper software folder. The right
area allows you to navigate to particular buttons on the different loaded profiles on the
mouse to apply macros or import them to the PC using the center arrow buttons.

The first dropdown on the right selects the Profile on the mouse

The second dropdown on the right selects the Button in that profile

The third box is where the macro on that button, if there is one, will show up to
tell you