Korg Pa4X User Manual page 484

470| Customizing and editing the Sounds
3 Use the Curve
crossfaded region.
Curve
Linear
Power
radio buttons to specify how the volume will change in the
Meaning
The volume will change linearly.
The volume will change non-linearly. Sometimes a setting of Linear
will produce the impression that the volume has dropped in the mid-
dle of the crossfade curve. In such cases, use Power.