Tone.AmplitudeEnvelope

↳ EXTENDS Tone.Envelope

Tone.AmplitudeEnvelope is a Tone.Envelope connected to a gain node. Unlike Tone.Envelope, which outputs the envelope’s value, Tone.AmplitudeEnvelope accepts an audio signal as the input and will apply the envelope to the amplitude of the signal. Read more about ADSR Envelopes on Wikipedia.

CONSTRUCTOR

new Tone.AmplitudeEnvelope ( [
attack
] , [
decay
] , [
sustain
] , [
release
] )
attack

The amount of time it takes for the envelope to go from 0 to it’s maximum value.

optional
decay

The period of time after the attack that it takes for the envelope to fall to the sustain value.

type: Time
optional
sustain

The percent of the maximum value that the envelope rests at until the release is triggered.

optional
release

The amount of time after the release is triggered it takes to reach 0.

type: Time
optional

EXAMPLE

var ampEnv = new Tone.AmplitudeEnvelope({
	"attack": 0.1,
	"decay": 0.2,
	"sustain": 1.0,
	"release": 0.8
}).toMaster();
//create an oscillator and connect it
var osc = new Tone.Oscillator().connect(ampEnv).start();
//trigger the envelopes attack and release "8t" apart
ampEnv.triggerAttackRelease("8t");

Members

inherited from Tone.AudioNode

.context

Tone.Context READONLY #

Get the audio context belonging to this instance.

</>
inherited from Tone.Envelope

.attackCurve

String or Array #

The shape of the attack. Can be any of these strings: <ul> <li>linear</li> <li>exponential</li> <li>sine</li> <li>cosine</li> <li>bounce</li> <li>ripple</li> <li>step</li> </ul> Can also be an array which describes the curve. Values in the array are evenly subdivided and linearly interpolated over the duration of the attack.

EXAMPLE

env.attackCurve = "linear";

EXAMPLE

//can also be an array
env.attackCurve = [0, 0.2, 0.3, 0.4, 1]
</>
inherited from Tone.Envelope

.decay

Time #

After the attack portion of the envelope, the value will fall over the duration of the decay time to it’s sustain value.

</>
inherited from Tone.Envelope

.release

Time #

After triggerRelease is called, the envelope’s value will fall to it’s miminum value over the duration of the release time.

</>
inherited from Tone.Envelope

.releaseCurve

String or Array #

The shape of the release. See the attack curve types.

EXAMPLE

env.releaseCurve = "linear";
</>
inherited from Tone.Envelope

.sustain

NormalRange #

The sustain value is the value which the envelope rests at after triggerAttack is called, but before triggerRelease is invoked.

</>
inherited from Tone.Envelope

.attack

Time #

When triggerAttack is called, the attack time is the amount of time it takes for the envelope to reach it’s maximum value.

</>
inherited from Tone.Envelope

.value

Number READONLY #

Read the current value of the envelope. Useful for syncronizing visual output to the envelope.

</>

Methods

.dispose ( )

#
↪ returns Tone.AmplitudeEnvelope

this

Clean up

</>
inherited from Tone.AudioNode

.disconnect ( )

#
output

Either the output index to disconnect if the output is an array, or the node to disconnect from.

↪ returns Tone.AudioNode

this

disconnect the output

</>
inherited from Tone.AudioNode

.toMaster ( )

#
↪ returns Tone.AudioNode

this

Connect ‘this’ to the master output. Shorthand for this.connect(Tone.Master)

EXAMPLE

//connect an oscillator to the master output
var osc = new Tone.Oscillator().toMaster();
</>
inherited from Tone.Envelope

.triggerAttackRelease ( )

#
duration

The duration of the sustain.

type: Time
time

When the attack should be triggered.

type: Time
default: now
velocity

The velocity of the envelope.

type: number
default: 1
↪ returns Tone.Envelope

this

triggerAttackRelease is shorthand for triggerAttack, then waiting some duration, then triggerRelease.

EXAMPLE

//trigger the attack and then the release after 0.6 seconds.
env.triggerAttackRelease(0.6);
</>
inherited from Tone.Envelope

.cancel ( )

#
after
type: Time
↪ returns Tone.Envelope

this

Cancels all scheduled envelope changes after the given time.

</>
inherited from Tone.Envelope

.triggerRelease ( )

#
time

When the release portion of the envelope should start.

type: Time
default: now
↪ returns Tone.Envelope

this

Triggers the release of the envelope.

EXAMPLE

//trigger release immediately
 env.triggerRelease();
</>
inherited from Tone.Envelope

.getValueAtTime ( )

#
time

The time in seconds.

type: Number
↪ returns Number

The scheduled value at the given time.

Get the scheduled value at the given time. This will return the unconverted (raw) value.

</>
inherited from Tone.Envelope

.triggerAttack ( )

#
time

When the attack should start.

type: Time
default: now
velocity

The velocity of the envelope scales the vales. number between 0-1

default: 1
↪ returns Tone.Envelope

this

Trigger the attack/decay portion of the ADSR envelope.

EXAMPLE

//trigger the attack 0.5 seconds from now with a velocity of 0.2
 env.triggerAttack("+0.5", 0.2);
</>
docs generated Sep 15 2019