Event : Environment : IdentityDictionary : Dictionary : Set : Collection : Object

Description

An Event specifies an action to be taken in response to a -play message. Its key/value pairs specify the parameters of that action. Event inherits most of its methods from its superclasses, especially from Dictionary. For the usage and meaning of the parent and proto events, see IdentityDictionary.a = (x: 6, y: 7, play: { (~x * ~y).postln }); a.play; // returns 6 * 7

a = (x: 6, y: 7, play: { (~x * ~y).postln });

a.play; // returns 6 * 7

The class Event provides a large library of default event instances and play functions, e.g. for pitch. By default, the play function, when an event is played, its type is used to select a function and a parent event (by default, this is type \note).(freq: 761).play // play a default synth sound with 761 Hz

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(freq: 761).play // play a default synth sound with 761 Hz

Class Methods

Class variables

Event.parentEvents

Event.partialEvents

Creation methods

Event.new(n: 8, proto, parent, know: true)

Event.default

Event.silent(dur: 1.0, inEvent)

Event.addEventType(type, func, parentEvent)

(

Event.addEventType(\happyEvent, {

    "I am so happy to be silent sometimes, says %.\n".postf(~who)

})

)

(type: \happyEvent, who: "Alice").play;

​

// using protoEvent

(

Event.addEventType(\happyEvent, {

    "I am so happy to be silent sometimes, says %.\n".postf(~who)

}, (who: "Alice"))

)

​

(type: \happyEvent).play; // use default

(type: \happyEvent, who: "Eve").play; // overrride default

​

// in a Pbind:

Pbind(\type, \happyEvent, \who, Prand(["Alice", "Bob", "Eve"], inf), \dur, Pwhite(0.1, 1.0, inf)).play;

​

// parent event type for indirect calls:

Event.addEventType(\test, { ("x was" + ~x.value).postln }, (x: { ~y + 1 }, y: 0));

​

(type: \test).play; // use defaults

(type: \test, \y: 7).play; // set the value that x refers to

(type: \test, \x: 10).play; // override x by a different one

​

​

// It is possible to reuse some of another event type's functionality:

(

Event.addEventType(\happyEvent, { |server|

    ~octave = [5, 6, 7]; // always play three octaves

    ~detune = 10.0.rand2; // always play a bit out of tune

    ~type = \note; // now set type to a different one

    currentEnvironment.play;

});

​

Pbind(\type, \happyEvent, \degree, Pseq([0, 1, 2, 3, 4, 4, 5, 5, 5, 5, 4, 2, 3, 2, 3, 1], inf), \dur, Pwhite(0.1, 1.0, inf)).play;

);

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// eventTypes

Event.partialEvents.playerEvent.eventTypes

// parentTypes

Event.partialEvents.playerEvent.parentTypes

Event.addParentType(type, parentEvent)

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Pbind(\type, \note, \degree, Pseq([0, 1, 2, 3, 4, 4, 5, 5, 5, 5, 4, 2, 3, 2, 3, 1], inf), \dur, 0.08).play;

Event.addParentType(\note, (mtranspose: 2, root:5)); // set different defaults

​

// note is the default type, this will also pick up the information:

Pbind(\degree, Pseq([0, 1, 2, 3, 4, 4, 5, 5, 5, 5, 4, 2, 3, 2, 3, 1], inf), \dur, 0.08).play;

Event.removeEventType(type)

Event.removeParentType(type)

Event.makeDefaultSynthDef

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SynthDef(\default, { |out| Out.ar(out, Line.kr(0.3, 0, 0.5) * SinOsc.ar(Rand(300, 500.0)) ) }).add; // overwrite default

(freq: 600).play;

Event.makeDefaultSynthDef; // reset default

(freq: 600).play;

Inherited class methods

Undocumented class methods

Event.checkIDs(id, server)

Event.eventTypes

Event.makeParentEvents

Event.parentTypes

Instance Methods

.play

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(freq: 800).play;

(play: {  "I rather do something else: ".post; ~x.postln; }, x: 800.rand).play;

.delta

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Pn((dur: 2, freq:8000)).play;

.next(inval)

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(a: 6, b: 7).next((c: 100));

.embedInStream(event)

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a = (note: 2);

b = (note: [3, 5]);

Pseq([a, b]).play;

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(

a = (

    pattern: Pbind(\note, Pgeom(1, 1.1, { 20.rand }), \dur, 0.05),

    embedInStream: { |event, inevent| event[\pattern].embedInStream(inevent) }

);

b = (note: [3, 5]);

c = (freq: 402, dur: 0.3);

Prand([a, b, c], inf).trace.play;

)

​

// change the events while playing

c[\freq] = [900, 1002, 1102];

c[\freq] = [200, 101, 1102];

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(

d = (

    a: 5, b: 7, c: 1,

    rout: Routine { |inval|

        inf.do { |i|

            var event = d.copy.put(\count, i);

            inval = event.embedInStream(inval);

        }

    }

);

)

​

// draw new values

d.rout.((z:999));

d.rout.((z:1, a:0));

d.rout.(());

.playAndDelta(cleanup, mute)

.isRest

.asUGenInput

.asControlInput

Methods that allow Events to provide user control for Synths on Groups

.synth

.group

.stop

.pause

.resume

.release(releaseTime)

.set( ... args)

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a = (note: 2).play;

a.set(\freq, 700);

a.release;

Inherited instance methods

Undocumented instance methods

.asEvent

.asEventStreamPlayer

.asGroup

.asOSC

.buildForProxy(proxy, channelOffset: 0)

.free

.isPlaying

.isPlaying = val

.isRunning = val

.nodeID

.proxyControlClass

.sendOSC(msg)

.split(key: 'id')

.synchWithQuant(quant)

Basic Usage

Events can be written as a series of key value pairs enclosed in parentheses. Empty parentheses will create an empty event. They may be also used for object prototyping - see Environment for more details.

Event as a name space for keeping objects

Because of this simple syntax, Events are often used as name space for keeping objects:// using an event to store values q = (n: 10, x: [1, 2, 3]); q[\y] = q[\x] * q[\n]; // similar to ~y = ~x * ~n, but in a separate name space q.y = q.x * q.n; // shorter way to do the same (pseudo-methods) q.y; // [ 100, 200, 300 ]

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// using an event to store values

q = (n: 10, x: [1, 2, 3]);

q[\y] = q[\x] * q[\n];    // similar to ~y = ~x * ~n, but in a separate name space

q.y = q.x * q.n;    // shorter way to do the same (pseudo-methods)

q.y;            // [ 100, 200, 300 ]

Event for specifying different things to happen

Event provides a defaultParentEvent that defines a variety of different event types and provides a complete set of default key/value pairs for each type. The type is determined by the value of the key \type which defaults to \note. Note events create synths on the server.( ).play; // the default note (freq: 500, pan: -1) .play; // 500 Hz, panned left (play: { ~what.postln }, what: "hello happening").play; // something else

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( ).play;            // the default note

(freq: 500, pan: -1) .play;    // 500 Hz, panned left

(play: { ~what.postln }, what: "hello happening").play;    // something else

Per default, the play message derives its behaviour from the defaultParentEvent, which provides many default values, such as default instrument (\default), note (0), legato (0.8) and so on. Depending on the event type, these may differ completely and need not even represent a sound.

Events and SynthDefs

The key used to select what synthdef is to be played is \instrument. In order to use a SynthDef with an Event, send it an add message. This creates a description of the SynthDef that the event can consult to determine its control names. The values of these names in the event are used when the event is played. (See SynthDesc for details.)( SynthDef(\pm, { |out=0, freq=440, amp=0.1, pan=0, gate=1, ratio = 1, index = 1, ar = 0.1, dr = 0.1| var z; z = LPF.ar( PMOsc.ar(freq, freq * ratio, Linen.kr(gate, ar,index, dr), 0, 0.3), XLine.kr(Rand(4000, 5000), Rand(2500, 3200), 1) ) * Linen.kr(gate, 0.01, 0.7, dr, 2); OffsetOut.ar(out, Pan2.ar(z, pan, amp)); }).add; ); (instrument: \pm).play; (instrument: \pm, ratio: 3.42, index: 12, freq: 150, ar: 8, dr: 3, sustain: 10).play;

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(

SynthDef(\pm, { |out=0, freq=440, amp=0.1, pan=0, gate=1, ratio = 1, index = 1, ar = 0.1, dr = 0.1|

    var z;

    z = LPF.ar(

        PMOsc.ar(freq, freq * ratio, Linen.kr(gate, ar,index, dr), 0, 0.3),

        XLine.kr(Rand(4000, 5000), Rand(2500, 3200), 1)

    ) * Linen.kr(gate, 0.01, 0.7, dr, 2);

    OffsetOut.ar(out, Pan2.ar(z, pan, amp));

}).add;

);

​

(instrument: \pm).play;

​

(instrument: \pm, ratio: 3.42, index: 12, freq: 150, ar: 8, dr: 3, sustain: 10).play;

Multi-channel Expansion

If a key relevant to the action is assigned an Array, the action is repeated on each element of the array:(degree: (0..12)).play; // a diatonic cluster

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(degree: (0..12)).play;        // a diatonic cluster

If several keys are assigned arrays, the action is repeated for each element of the largest array. Smaller arrays are rotated through repeatedly. Here are some examples:// every other note of the diatonic cluster: stacked thirds (degree: (0..12), amp: [0, 0.1]).play; // every other note of the semitone cluster: a wholetone cluster again (note: (0..12), amp: [0, 0.1]).play; // every third note of the semitone cluster: a diminished chord (note: (0..12), amp: [0, 0, 0.1]).play; // the same with different sustain times (note: (0..12), amp: [0, 0, 0.1], sustain:[0.1, 0.3, 1.3, 2.5]).play; // timingOffset gives a tempo-relative offset time to each synth (instrument: \pm, ratio: [2.3, 4.5, 1.7], timingOffset: [0, 1.2, 3], sustain: [0.2, 2, 1]).play;

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// every other note of the diatonic cluster: stacked thirds

(degree: (0..12), amp: [0, 0.1]).play;

​

// every other note of the semitone cluster: a wholetone cluster again

(note: (0..12), amp: [0, 0.1]).play;

​

// every third note of the semitone cluster: a diminished chord

(note: (0..12), amp: [0, 0, 0.1]).play;

​

// the same with different sustain times

(note: (0..12), amp: [0, 0, 0.1], sustain:[0.1, 0.3, 1.3, 2.5]).play;

​

// timingOffset gives a tempo-relative offset time to each synth

(instrument: \pm, ratio: [2.3, 4.5, 1.7], timingOffset: [0, 1.2, 3], sustain: [0.2, 2, 1]).play;

In the \note event, all keys multichannel expand apart from: \instrument, \dur, \delta, \strum.

Arrayed Arguments

It is possible to assign an array to one of a SynthDef's control names. For example:( SynthDef(\test, { | out = 0, amp = 0.01, freq = #[300,400,400], pan, gate = 1 | var audio, env; audio = Mix.ar(Pulse.ar(freq, 0.5)); // this is a mixture of three oscillators env = Linen.kr(gate, susLevel: amp , doneAction: Done.freeSelf); audio = audio * env; OffsetOut.ar(out, audio); }).add; )

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(

SynthDef(\test, {

    | out = 0, amp = 0.01, freq = #[300,400,400], pan, gate = 1 |

    var audio, env;

    audio = Mix.ar(Pulse.ar(freq, 0.5));    // this is a mixture of three oscillators

    env = Linen.kr(gate, susLevel: amp , doneAction: Done.freeSelf);

    audio = audio * env;

    OffsetOut.ar(out, audio);

}).add;

)

Within an event, arrayed arguments of this sort must be enclosed within an additional array to distinguish them from arguments intended for multi-channel expansion.// one synth, use enclosing array to prevent multi-channel expansion (instrument: \test, note: [[0, 2, 4]]).play; // two synths (instrument: \test, note: [[0, 2, 4], [6, 8, 10]]).play;

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// one synth, use enclosing array to prevent multi-channel expansion

(instrument: \test, note: [[0, 2, 4]]).play;

​

// two synths

(instrument: \test, note: [[0, 2, 4], [6, 8, 10]]).play;

Events and Patterns

Events are closely integrated with the Patterns library. Different patterns can be bound to different keys (or collections of keys) to specify the resultant music. See the help files Pattern and Pbind and the tutorials Understanding Streams, Patterns and Events - Part 4 and Understanding Streams, Patterns and Events - Part 5 for more details on Patterns.

Patterns that return events may be played on a clock: dur specifies the time between two subsequent events.// Pseq returns one item in the list after the other ( Pseq([ (note: 2, sustain: 1, dur: 1.5), (note: [5, 7], sustain: 0.5, dur: 0.8), (note: [2, 6], sustain: 1, dur: 0.8) ]).play; ) // Pbind binds parameters to events: ( Pbind( \note, Pseq([2, [5, 7], [2, 6]]), \sustain, Pseq([1, 0.5, 1]), \dur, Pseq([1.5, 0.8, 0.8]) ).play; ) // per-event timing may be specified: ( Pbind( \note, Pseq([[0, 9], [5, 7], [2, 6]], inf), \sustain, Pseq([1, 0.5, 1], inf), \dur, Pseq([1.5, 0.8, 0.8], inf), \timingOffset, Pseq([[0, 0.3], [0, 0.01]], inf) ).play; )

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// Pseq returns one item in the list after the other

(

Pseq([

    (note: 2, sustain: 1, dur: 1.5),

    (note: [5, 7], sustain: 0.5, dur: 0.8),

    (note: [2, 6], sustain: 1, dur: 0.8)

]).play;

)

​

// Pbind binds parameters to events:

(

Pbind(

    \note, Pseq([2, [5, 7], [2, 6]]),

    \sustain, Pseq([1, 0.5, 1]),

    \dur, Pseq([1.5, 0.8, 0.8])

).play;

)

​

// per-event timing may be specified:

(

Pbind(

    \note, Pseq([[0, 9], [5, 7], [2, 6]], inf),

    \sustain, Pseq([1, 0.5, 1], inf),

    \dur, Pseq([1.5, 0.8, 0.8], inf),

    \timingOffset, Pseq([[0, 0.3], [0, 0.01]], inf)

).play;

)

Here is an example that illustrates some more of the keys defined by the defaultParentEvent. Note that it is equivalent to write Pbind(\key, val, ...) and Pbind(*[key: val, ...]).( Pbind(*[ stepsPerOctave: Pstep(Pseq((2..12).mirror, inf),12), // 3 - 12 tone e.t. scales note: Pseq((0..12).mirror, inf), // play full notes up and down ctranspose: Pwhite(-0.2, 0.2), // detune up to +-20 cents detune: Pwhite(-1.0, 1.0), // detune up to 1 Hz sustain: Prand([0.2, 0.2, 0.2, 4], inf), // notes last 0.2 or 4 seconds // 1 in 6 chance waits 0.8 seconds: dur: Prand([0.2, 0.2, 0.2, 0.2, 0.2, 0.8], inf), db: Pstep(Pseq([-15, -25, -20, -25], inf), 0.8)// 4 beat accent structure ]).play; )

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(

Pbind(*[

    stepsPerOctave:    Pstep(Pseq((2..12).mirror, inf),12),    // 3 - 12 tone e.t. scales

    note:        Pseq((0..12).mirror, inf),        // play full notes up and down

    ctranspose:    Pwhite(-0.2, 0.2),            // detune up to +-20 cents

    detune:        Pwhite(-1.0, 1.0),            // detune up to 1 Hz

    sustain:    Prand([0.2, 0.2, 0.2, 4], inf),     // notes last 0.2 or 4 seconds

                // 1 in 6 chance waits 0.8 seconds:

    dur:        Prand([0.2, 0.2, 0.2, 0.2, 0.2, 0.8], inf),

    db:        Pstep(Pseq([-15, -25, -20, -25], inf), 0.8)// 4 beat accent structure

]).play;

)

Event's play method

When an Event (or any other Environment) receives a use(function) message, it sets itself to be currentEnvironment, evaluates the function, and restores the original value of currentEnvironment. This allows the function to access and alter the contents of the event using the following shortcuts: ~keyName which is equivalent to currentEnvironment.at(keyName) and ~keyName = value which is equivalent to currentEnvironment.put(keyName, value).

We will write ~keyName whenever referring to the value stored at the key keyName in the event.

Here is the definition of Event's play method:play { if (parent.isNil) { parent = defaultParentEvent }; this.use { ~play.value }; }

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play {

    if (parent.isNil) { parent = defaultParentEvent };

    this.use { ~play.value };

}

Thus we can see that the defaultParentEvent is used unless otherwise specified and the function stored in ~play is executed in the context of the Event. It can be replaced in a given event for different behavior:(a: 6, b: 7, play: { (~a * ~b).postln }).play;

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(a: 6, b: 7, play: { (~a * ~b).postln }).play;

Timing control with Event's delta method

Events also specify timing within a Pattern. Event's delta method returns the value of ~delta or, if that is nil, ~dur * ~stretch.

Patterns are played by TempoClocks, which have their own tempo controls. This tempo which can be controlled through ~tempo in the event. Changes to the tempo affect everything else scheduled by the TempoClock, so tempo provides a global tempo control while stretch provides a control limited to the one pattern.

The structure of defaultParentEvent

defaultParentEvent

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playerEvent    // defines ~play, ~type and ~eventTypes

serverEvent    // server, group, addAction

durEvent    // duration, tempo and articulation

ampEvent    // volume, pan, MIDI velocity

pitchEvent    // pitch specified in many different ways

bufferEvent    // buffers on the server

midiEvent    // defines the sending of midi messages

Useful keys for notes

Using Events is largely a matter of overwriting keys. Here is a list of keys useful for defining notes with their default values, grouped by the partialEvent within which they are defined.

• serverEvent keys:

  The keys in serverEvent provide the values needed to identify the server to be used and where in the tree of nodes to place the group.server: nil, // if nil, Server.default is used instrument: \default, // this is the name of a SynthDef group: 1, // nodeID of group on the server // when adding before or after a node // this could be the nodeID of a synth instead of a group addAction: 0, // 0, 1, 2, 3 or \addToHead, \addToTail, \addBefore, \addAfter out: 0, // usually an output bus number, but depends on the SynthDef

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  server:        nil,        // if nil, Server.default is used

  instrument:    \default,    // this is the name of a SynthDef

  group:        1,        // nodeID of group on the server

                  // when adding before or after a node

                  // this could be the nodeID of a synth instead of a group

  addAction:    0,        // 0, 1, 2, 3 or \addToHead, \addToTail, \addBefore, \addAfter

  out:        0,        // usually an output bus number, but depends on the SynthDef

• ampEvent keys:

  The ampEvent determines volume. Notice that ~amp is a function that determines its value from ~db. The user can choose to specify the amplitude directly by overwriting ~amp or to use a decibel specification by overwriting ~db.amp: #{ ~db.dbamp }, // the amplitude db: -20.0, // the above described in decibel pan: 0.0, // pan position: -1 left 1 right velocity: 64 // midi velocity trig: 0.5 // trigger value

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  amp:        #{ ~db.dbamp },    // the amplitude

  db:        -20.0,        // the above described in decibel

  pan:        0.0,        // pan position: -1 left 1 right

  velocity:    64        // midi velocity

  trig:        0.5        // trigger value

• durEvent keys:

  The durEvent has keys that determine the timing of a note. Notice that ~sustain is a function that uses ~legato to determine the sustain. Like ~amp this can be overwritten to set the sustain directly.tempo: nil, // changes tempo of a TempoClock dur: 1.0, // time until next note (inter-onset time) stretch: 1.0, // inverse of tempo control, specific to the Event's stream legato: 0.8, // ratio of sustain to duration sustain: #{ ~dur * ~legato * ~stretch }, lag: 0.0, // delay (in seconds) relative to current time position of Stream timingOffset: 0.0, // delay (in beats) relative to current time position of Stream strum: 0.0 // "breaks" a chord. May be negative, playing the chord backward strumEndsTogether: false // if true, the strummed notes end together (with gated synths) sendGate: nil // override: true == always send a gate-release message; false == never send

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  tempo:            nil,    // changes tempo of a TempoClock

  dur:            1.0,    // time until next note (inter-onset time)

  stretch:        1.0,    // inverse of tempo control, specific to the Event's stream

  legato:            0.8,    // ratio of sustain to duration

  sustain:        #{ ~dur * ~legato * ~stretch },

  lag:            0.0,    // delay (in seconds) relative to current time position of Stream

  timingOffset:        0.0,    // delay (in beats) relative to current time position of Stream

  strum:            0.0    // "breaks" a chord. May be negative, playing the chord backward

  strumEndsTogether:    false    // if true, the strummed notes end together (with gated synths)

  sendGate:        nil  // override: true == always send a gate-release message; false == never send

• pitchEvent keys:

  The pitchEvent has the most complex system of functions that provide a variety of useful ways to determine pitch:freq (->440) // determines the pitch directly as a frequency in Hertz midinote (-> 60) // determines pitch as a fractional MIDI note (69 -> 440) note (-> 0) // determines pitch as a scale degree in an ~stepsPerOctave equal tempered scale degree: 0 // determines pitch as a scale degree within the scale ~scale

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  freq (->440)        // determines the pitch directly as a frequency in Hertz

  midinote (-> 60)    // determines pitch as a fractional MIDI note (69 -> 440)

  note (-> 0)        // determines pitch as a scale degree in an ~stepsPerOctave equal tempered scale

  degree: 0        // determines pitch as a scale degree within the scale ~scale

  The event also provides a set of transposition keys:mtranspose: 0 // modal transposition of degree within a scale root: 0.0 // transposes root of the scale gtranspose: 0.0 // gamut transposition within the ~stepsPerOctave equal tempered scale ctranspose: 0.0 // chromatic transposition within the 12 tone equal tempered scale harmonic: 1.0 // multiplies the frequency determined by ~midinote, typically to an overtone detune: 0.0 // directly offsets frequency by adding this value midiToCps // a function taking a MIDI note number and turning it into frequency // Normally this is _.midicps, but you can override it for non-ET tunings mtranspose: 0, // modal transposition of degree gtranspose: 0.0 // gamut transposition of note within a ~stepsPerOctave e.t. scale ctranspose: 0.0 // chromatic transposition of midinote within 12 tone e.t. scale octave: 5.0 // octave offest of note root: 0.0 // root of the scale degree: 0 // degree in scale scale: #[0, 2, 4, 5, 7, 9, 11] // diatonic major scale stepsPerOctave: 12.0 // detune: 0.0, // detune in Hertz harmonic: 1.0 // harmonic ratio octaveRatio: 2.0 // size of the octave (can be used with the Scale class)

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  mtranspose:    0    // modal transposition of degree within a scale

  root:        0.0    // transposes root of the scale

  gtranspose:    0.0    // gamut transposition within the ~stepsPerOctave equal tempered scale

  ctranspose:    0.0    // chromatic transposition within the 12 tone equal tempered scale

  harmonic:    1.0    // multiplies the frequency determined by ~midinote, typically to an overtone

  detune:        0.0    // directly offsets frequency by adding this value

  midiToCps        // a function taking a MIDI note number and turning it into frequency

              // Normally this is _.midicps, but you can override it for non-ET tunings

  ​

  mtranspose:    0,    // modal transposition of degree

  gtranspose:    0.0    // gamut transposition of note within a ~stepsPerOctave e.t. scale

  ctranspose:    0.0    // chromatic transposition of midinote within 12 tone e.t. scale

  ​

  octave:        5.0    // octave offest of note

  root:        0.0    // root of the scale

  degree:        0    // degree in scale

  scale:        #[0, 2, 4, 5, 7, 9, 11]    // diatonic major scale

  stepsPerOctave:    12.0    //

  detune:        0.0,    // detune in Hertz

  harmonic:    1.0    // harmonic ratio

  octaveRatio:    2.0    // size of the octave (can be used with the Scale class)

  The event calculates with these keys to derive parameters needed for the synth:note: #{ // note is the note in halftone steps from the root (~degree + ~mtranspose).degreeToKey(~scale, ~stepsPerOctave); } midinote: #{ // midinote is the midinote (continuous intermediate values) ((~note.value + ~gtranspose + ~root) / ~stepsPerOctave + ~octave) * 12.0; } freq: #{ (~midinote.value + ~ctranspose).midicps * ~harmonic; } detunedFreq: #{ // finally sent as "freq" to the synth as a parameter, if given ~freq.value + ~detune }

  xxxxxxxxxx

   

  note: #{    // note is the note in halftone steps from the root

      (~degree + ~mtranspose).degreeToKey(~scale, ~stepsPerOctave);

  }

  midinote: #{    // midinote is the midinote (continuous intermediate values)

      ((~note.value + ~gtranspose + ~root) / ~stepsPerOctave + ~octave) * 12.0;

  }

  freq: #{

      (~midinote.value + ~ctranspose).midicps * ~harmonic;

  }

  detunedFreq: #{    // finally sent as "freq" to the synth as a parameter, if given

      ~freq.value + ~detune

  }
  

Event types

An Event responds to a play message by evaluating ~play in the event, which by default uses the event's type to define the action to be performed. See Event types.