Akai MPC User Manual page 35

In the grid, you can see your recorded note events. Click and drag a note to move it to a different
position. By default, you can position notes only by quantization values, defined by the Time Correct
value. You can change the value by clicking the Time Correct drop-down menu. We recommend
working with 8 or 16 values. Hold down your keyboard's Shift key and use the arrow keys to nudge
events without restricting ("snapping") them to the grid.
Hold down your keyboard's Control key (Windows) or  key (Mac OS X) and click and drag a note to
copy it. Double-click a note to delete it.
Velocity data can be easily edited in the velocity lane below the grid. Click a note event or place the
mouse over a velocity bar in the lane. A small round handle will appear at the top of the velocity bar.
Move the mouse vertically to change its value.
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