Hercules DJControl Inpulse 200 MK2 User Manual page 12

In Serato DJ Lite and Serato DJ Pro, when Sync mode is
enabled, pressing SHIFT and moving the tempo fader at
the same time lets you move the tempo fader's values
while maintaining the amplitude.
For example, with a tempo scale of ±8%, or 16%
amplitude, you can move the tempo fader's values to
cover from 0% (maximum) to -16% (minimum), which
still results in 16% amplitude, with -8% in the center.
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