Hercules DJCONTROL INPULSE T7 Manual page 23

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.
23