Akai MPCX User Manual page 219

Stretch Factor
Sustain
Time-Stretch
Track
Trigger
Warp
The stretch factor is a value generated by the
record an audio file, the current sequence tempo will be embedded with it. This information
is stored within the sample file when you save the project. When you warp an audio track
region, the warping algorithm uses this sequence tempo and the current value in the BPM
field to generate the stretch factor.
This term describes the level of an
and decay phases. Once reached, the sustain level is kept until the trigger is terminated.
See Warp below.
A sequence on MPC X can contain 128 MIDI tracks and 8 audio tracks.
Each MIDI track contains MIDI note events and controller data. In this case, the track
contains no audio information—only MIDI information that uses the samples in a program (or
an external MIDI sound module) to generate its audio. You can edit your performance in
many different ways once the performance has been captured.
Each audio track contains an audio signal that has been recorded or imported into your
project. You can edit this audio within the software and incorporate it into your sequences
alongside your MIDI tracks.
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.
The Warp feature in the MPC X lengthens or shortens a region of an audio track or sample
without changing its pitch. This enables you to fit the length of an audio track or sample to
the length of a sequence, a bar in your sequence, etc. while maintaining its original key.
Please note that the Warp algorithms are very CPU-intensive and can result in audio drop-
outs during playback if used too freely. Be mindful of how (and how often) you use the warp
function. You can reduce the CPU resources required by doing any/all of the following:
Minimize the amount of pitch adjustment of warped audio.
Avoid warping very small audio regions.
Warp as few tracks or track regions as possible (i.e., reduce the number of total number
of voices of the polyphonic limit that use the Warp algorithm at a given time), especially
instances where the warped regions start at the same time.
Avoid rapidly triggering samples that are warped.
Warp algorithm in the software. When you
envelope remaining constant after it has passed the attack
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