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User’s Manual Pulse • PulsePlus

8.5 Envelopes

The Pulse's envelopes allow you to manipulate the sound parameters via rate or timed

modulations. These envelopes feature ADSR characteristics.

 Most analog synthesizers feature ADSR envelopes. These envelopes are made up of

four parameters that determine their response: Attack, Decay, Sustain and Release.

The following diagrams illustrate the structure of an ADSR envelope:

Diagram 8: Structure of an ADSR envelope

The envelope is started by pressing a key. It ascends to its maximum value at the rate

determined by the Attack parameter. It then descends at the rate determined by the

Decay value until it reaches the predetermined Sustain value. It remains at this value

until the key is released. The envelope then descends to zero at the rate determined

by the Release parameter.

Envelope 1

The first envelope is designed to control the filter (VCF) but can also be used for other

modulations. The following parameters determine the envelope's response.

Attack 0...127 Determines the attack rate or amount of time it takes

for a signal's volume to go from zero to maximum

level. A value of 0 is equivalent to less than two

milliseconds and 127 is equivalent to approx. 1 minute.

Decay 0...127 Determines the decay rate or amount of time it takes

for a signal to reach the sustain phase. The values are

the same as for attack. Note that Sustain values near

zero reduce the duration of this phase.

Sustain 0...127 Determines the sustain level which is held until a note

ends.

Release 0...127 Once the note has ended, the release phase begins.

During this phase, the envelope fades to zero at the

rate determined by the release value. The values are

the same as for attack. Note that a sustain value other

than zero reduces the length of this phase.

Attack Decay Sustain Release Keytrack Trigger

ENV1/2

Attack Decay Release

Sustain

Depth

Time

Key pressed Key released

100%

1 2 ... 23 24 25 26 27 28 29 30 31 32 33 ... 77 78

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Waldorf Pulse Manuel d'utilisateur Page 28