Akai MPC X User Manual page 217

The Fade In process sets a fade-in between the start point
and end point. The following types are available:
Linear fades the audio in with a linear curve—a
straight line between the start and end.
Log fades the audio in with a logarithmic curve—quickly
rising at the start and flattening out towards the end.
Exp fades the audio in with an exponential curve—
slowly rising in the beginning and growing steeper
towards the end.
The Fade Out process sets a fade-out between the start
point and end point. The following types are available:
Linear fades the audio out with a linear curve—a
straight line between the start and end.
Log fades the audio out with a logarithmic curve—
quickly rising at the start and flattening out towards the
end.
Exp fades the audio out with an exponential curve—
slowly rising in the beginning and growing steeper
towards the end.
The Pitch Shift process changes the pitch of the sample
without changing its length. This lets you set the sample's
pitch to your sequence without affecting the sample's
tempo or duration. You can adjust it up to 12 semitones,
up or down. Keep in mind that the audio quality may
decrease at more extreme settings.
The Gain Change process raises or lowers the volume of
the sample. You can adjust it up to 18 dB, higher or lower.
This function is different than Normalize because it will
allow volumes beyond clipping level. This may be a
desired effect, but remember to watch your output level!
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