Akai MPC Touch, Руководство пользователя

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Stretch Factor
The stretch factor is a value generated by the
Warp
algorithm in the software. When you
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.
Sustain This term describes the level of an envelope remaining constant after it has passed the attack
and decay phases. Once reached, the sustain level is kept until the trigger is terminated.
Time-Stretch See Warp below.
Track
A sequence on your MPC hardware 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.
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.
Warp The Warp feature 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.
In Program Edit Mode, avoid using extreme Stretch values.
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.
If you have warped samples used in a drum program, consider using the Flatten Pad
function to consolidate the affected pad’s layers into one audio sample (see here to learn
about this). After you flatten the pad, its sample/samples no longer need to be warped.