Temporal envelopes are an essential building block of sound synthesis algorithms. They are introduced in the Control Section of the CMB content:
ADSR in PD
The ADSR envelope is the most widely used temporal envelope. The PD help files contain an example, which can serve as a starting point for an ADSR object. It can also be downloaded here: ADSR
Open the example or download the patch and store the object in your working directory.
Once stored, the object can be used in custom patches to control
arbitrary parameters. The following example controls the gain of a
sine wave oscillator with an ADSR envelope.
adsr object has six inlets:
1: the trigger
2: the peak value
3: the attack time (ms)
4: the decay time (ms)
5: the sustain amount (0...100%)
6: the release time (ms)
The delay object emulates a
555 ms key press. The only outlet is an
audio rate signal with the envelope:
Add a second ADSR with individual parameters to control the pitch of the tone.