Akai MPC User Manual page 360

To select how the empty pads will display, click the Empty Pads field:
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Empty pads off: Pads without any sounds will remain off.
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Empty pads dim: Pads without any sounds will remain more dimly lit than pads with sounds assigned.
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Empty pads normal: Pads without any sounds will appear the same as pads with sounds assigned.
To determine whether you want to edit all pads or just one pad, click the Pads field and select Edit
All Pads or Edit Single Pads.
To show or hide the RGB (red, green, blue) palette of colors, click the Show RGB Palette box.
To select a color for the pad, click a color button.
Hardware: Lime green is now an available pad color.
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