14. MORE ON OSCILLATORS, FILTERS, AND ENVELOPES
70
6–7
Exponential attack, exponential decay/release. Since our hearing perceives loudness exponentially,
this shape is primarily useful as an amplitude envelope for very long sounds that are supposed to fade
in and fade out at a very constant rate. When used as a filter envelope, very clicky, whip lash-like sounds
can also be obtained by using this shape.
8–9
Full attack, linear decay/release. The envelope will immediately rise to the full envelope level and
stay there for the whole attack phase. The ATK parameter sets the duration of this attack phase. The
envelope shape is useful as amplitude envelope for certain percussive sounds that need a punch at full
volume followed by a quick decay, or for other sounds that should contain a full body before being enter-
ing the decay phase.
10–11
Full attack, exponential decay/release. The envelope behaves like shape 8-9 mentioned above, but
decay and release will fall in a more snappy fashion, ending with a tail. This makes it even more useful for
percussive sounds.
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