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SPEED GRADATIONS
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Some people only see their dances as 3 speeds. Fast, Medium, and Slow.
A more selective group may choose to use up to 9 speeds (1-9) which makes finer gradations of speed, 3 different speeds for each column, with a potential of 3 colors in each column.
And still, another group may seek even finer gradations by using BPM. Using BPM in combination, or not, with speed, can give you up to 30 different speed gradations for a given loadset.