envelopes.lib

This library contains a collection of envelope generators. Its official prefix is en.

Functions Reference

An envelope with an exponential attack and release. smoothEnvelope is a standard Faust function.

smoothEnvelope(ar,t) : _

ar: attack and release duration (s)
t: trigger signal (attack is triggered when t>0, release is triggered when t=0)

AR (Attack, Release) envelope generator (useful to create percussion envelopes). ar is a standard Faust function.

ar(at,rt,t) : _

Where:

at: attack (sec)
rt: release (sec)
t: trigger signal (attack is triggered when t>0, release is triggered when t=0)

ARFE (Attack and Release-to-Final-value Exponentially) envelope generator. Approximately equal to smoothEnvelope(Attack/6.91) when Attack == Release.

arfe(a,r,f,t) : _

Where:

a, r: attack (sec), release (sec)
f: final value to approach upon release (such as 0)
t: trigger signal (attack is triggered when t>0, release is triggered when t=0)

ARE (Attack, Release) envelope generator with Exponential segments. Approximately equal to smoothEnvelope(Attack/6.91) when Attack == Release.

are(a,r,t) : _

Where:

a: attack (sec)
r: release (sec)
t: trigger signal (attack is triggered when t>0, release is triggered when t=0)

ASR (Attack, Sustain, Release) envelope generator. asr is a standard Faust function.

asr(at,sl,rt,t) : _

Where:

at: attack (sec)
sl: sustain level (between 0..1)
r: release (sec)
t: trigger signal (attack is triggered when t>0, release is triggered when t=0)

ADSR (Attack, Decay, Sustain, Release) envelope generator. adsr is a standard Faust function.

adsr(at,dt,sl,rt,gate) : _

Where:

at: attack time (sec)
dt: decay time (sec)
sl: sustain level (between 0..1)
rt: release time (sec)
gate: trigger signal (attack is triggered when gate>0, release is triggered when gate=0)

ADSRE (Attack, Decay, Sustain, Release) envelope generator with Exponential segments.

adsre(a,d,s,r,g) : _

Where:

a: attack (sec)
d: decay (sec)
s: sustain (fraction of t: 0-1)
r: release (sec)
g: gate signal: attack is triggered when g goes from zero to positive, release is triggered when g returns to 0

ASRE (Attack, Sustain, Release) envelope generator with Exponential segments.

asre(a,s,r,g) : _

Where:

a: attack (sec)
s: sustain (fraction of t: 0-1)
r: release (sec)
t: trigger signal (attack is triggered when t>0, release is triggered when t=0)

DX7 operator envelope generator with 4 independent rates and levels. It is essentially a 4 points BPF.

dx7_envelope(R1,R2,R3,R4,L1,L2,L3,L4,t) : _

Where: