Akai MPC User Manual page 279

Song The software has a special Song Mode that allows you to arrange different sections
(verse, chorus, hook, etc.) in order to build a Song. Each Song can have up to 250
parts and the software can hold 20 Songs in its memory.
This term describes the level of an envelope remaining constant after it has passed the
Sustain
Attack and Decay phases. Once reached, the Sustain level is kept until the trigger is
terminated.
A Sequence offers 64 Tracks and each Track can record notes and controller data. For
Track
example, you can record the verses of a Song on Track 1, while recording the choruses
on Track 2. Alternatively, you can record different instruments on each Track.
Note that your performances are recorded as MIDI events and the actual digital audio is
not recorded onto a Track. That way, you can edit your performance in many different
ways once the performance has been captured.
Trigger A trigger is a signal that initiates events. Trigger signals are very diverse. For instance, a
MIDI note or an audio signal can be used as a trigger. The events a trigger can initiate
are also very diverse. A common application for a trigger is its use to start an envelope.
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