Akai MPC Essentials User Manual page 66

The Filter Envelope controls affect the filter frequency. The knobs control the envelope shape or time-
variant modulation output. Adjust envelope's influence on the filter frequency with the Env knob. See the
following Anatomy of an Envelope section below to learn about the envelope parameters.
The Amp Envelope controls affect level changes over time. The knobs control the envelope shape or
time-variant modulation of a sound's level. See the following Anatomy of an Envelope section below to
learn about the envelope parameters.
Anatomy of an Envelope
An envelope creates a variable control signal. It can be used, for instance, to modulate the filter settings
of a sound over a given period of time.
For Drum Programs, the software offers two envelope types comprised of separately controllable
parameters. Click the AD box to check or uncheck it, letting you switch between two envelope types: AD
(checked) or AHDS (unchecked).
For Keygroup Programs, the software offers only AHDS envelopes.
With AHDS envelopes, the following happens when you trigger a
sample:
1. Within the period of time you have defined with the Attack (Atk)
parameter, the sample volume rises to its maximum value.
2. The sample's maximum volume will be maintained during the Hold
phase.
3. During the Decay phase, the sample's volume will gradually drop to the sustain level.
4. The sample's volume will stay at the sustain level (Sust) until the pad or key is released.
With AD envelopes, the following happens when you trigger a sample:
1. Within the period of time you have defined with the Attack (Atk)
parameter, the sample volume rises to its maximum value.
2. The sample's maximum volume will be maintained until its Decay
phase, when the sample's volume will gradually drop to zero over
the set duration. Click the Type drop-down menu to select Decay
From Start (the volume will start decreasing immediately after reaching its maximum level) or Decay
From End (the maximum volume will be maintained for a hold phase until it reaches the decay
phase).
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