Akai S6000 Operator's Manual page 110

EDIT PROGRAM
HIGH VELOCITY
LOW VELOCITY
ZONE XFADE
100
This parameter set the high velocity range for the selected zone.
This parameter sets the low velocity for the selected zone.
For normal playback, you would normally set a zone to have a velocity
range of 0-127. However, by assigning different samples to the zones
and setting high and low velocity as appropriate, you can achieve velocity
crossfade and switching. For example:
In the first example, there are four distinctly different bass samples played
with different styles and these can be switched between using MIDI
velocity. Play soft and you'll hear the sample SOFTBASS; play a bit
harder and you'll hear THUMBBASS but really hit your keyboard hard
and you'll hear PULL BASS.
If the velocity ranges overlap as shown in the second example, you can
use ZONE XFADE (F16) so that the zones will crossfade giving a
smoother transition.
This 'checkbox' switches velocity crossfade on and off. With it set to off,
the zones will switch; when set to ON, zones with overlapping velocity
ranges will crossfade for a smoother transition.
s5000 / s6000
Version 1.21