Bz Buzz

Haiku : Il fuco vola via. La regina è schiava. (Fight Club, Chuck Palahniuk)

(
{
var source;
var fx;
var n=10;

source= EnvGen.ar(Env([0,1,0],[0.1,1.5]),LFNoise1.kr(Rand(20,30)))*Saw.ar(170,0.5);

fx= Mix.fill(n, {
var maxdelaytime= rrand(0.01,0.03);
var half= maxdelaytime*0.5;
var quarter= maxdelaytime*0.25;

DelayC.ar(source, maxdelaytime, LFNoise1.kr(Rand(5,10),0.01,0.02) )

})!2;

fx
}.play
)


(Env([0,1,0],[0.1,1.5])).plot

DelayC simple delay line with cubic interpolation
DelayC.ar(in, maxdelaytime, delaytime, mul, add)
DelayC.kr(in, maxdelaytime, delaytime, mul, add)

Simple delay line with cubic interpolation. See also DelayN which uses no interpolation, and DelayL which uses linear interpolation. Cubic interpolation is more computationally expensive than linear, but more accurate.

See also BufDelayC.

in - the input signal.
maxdelaytime - the maximum delay time in seconds. used to initialize the delay buffer size.
delaytime - delay time in seconds.


EnvGen envelope generator

Inherits from: Object : AbstractFunction : UGen

Plays back break point envelopes. The envelopes are instances of the Env class. See the Env for more info. The arguments for levelScale, levelBias, and timeScale are polled when the EnvGen is triggered and remain constant for the duration of the envelope.

*ar(envelope, gate, levelScale, levelBias, timeScale, doneAction)
*kr(envelope, gate, levelScale, levelBias, timeScale, doneAction)


envelope - an instance of Env, or an Array of Controls. (See Control and the example below for how to use this.)
gate - this triggers the envelope and holds it open while > 0. If the Env is fixed-length (e.g. Env.linen, Env.perc), the gate argument is used as a simple trigger. If it is an sustaining envelope (e.g. Env.adsr, Env.asr), the envelope is held open until the gate becomes 0, at which point is released.
levelScale - scales the levels of the breakpoints.
levelBias - offsets the levels of the breakpoints.
timeScale - scales the durations of the segments.
doneAction - an integer representing an action to be executed when the env is finished playing. This can be used to free the enclosing synth, etc. See UGen-doneActions for more detail.


Env envelope

superclass: Object

An Env is a specification for a segmented envelope. Envs can be used both server-side, by an EnvGen within a SynthDef, and clientside, with methods such as at and asStream, below. An Env can have any number of segments which can stop at a particular value or loop several segments when sustaining. It can have several shapes for its segment


LFNoise1 ramp noise

LFNoise1.ar(freq, mul, add)
LFNoise1.kr(freq, mul, add)

Generates linearly interpolated random values at a rate.
freq - approximate rate at which to generate random values.

(
{
    Mix.fill(37,
        {
        var freq;
        freq = exprand(100, 3000);
        Pan2.ar(
            SinOsc.ar(
                        freq * LFNoise1.kr(1/6, 0.4, 1),
                        mul: EnvGen.kr(Env.perc(0, (freq**(-0.7))*100), Dust.kr(1/5))
                    ), LFNoise1.kr(1/8)
                )
        })*0.3
}.play

)

vediamo un pò, questo è un esempio che ho preso dal libro di David Cottle, la variabile freq è un valore random in una distribuzione esponenziale da 100 a 3000 hz, quindi avremo più probabilità di sentire valori bassi(?) o alti, mi sembra valori bassi; abbiamo un Mix di 37 Sinusoidi ogniuna con una freq diversa moltiplicata per un LFNoise tra 1 e 1.4 e una frequenza molto bassa 0.16~; il mul delle sinusoidi è dato da un Envelope di tipo percussivo attacco 0, release dipendente dalla frequenza; l'envelope è triggerato da un Dust.kr; il posizionamento spaziale della Sinusoide è definito da LFNoise1.kr(1/8);

per LFNoise, Ugens with a default range of 0 to 1:
-The add is the low end of the range
-The mul is the amount of deviation above the low.
-The mul + add is the high end of the range
-The mul is the range


Dust                        random impulses

Dust.ar(density, mul, add)

Generates random impulses from 0 to +1.
density - average number of impulses per second



exprand

Generates a single random float value in an exponential distributions from lo to hi.


Mix         sum an array of channels

Mix.new(array)

Mix will mix an array of channels down to a single channel or an array of arrays of channels down to a single array of channels. More information can be found under MultiChannel.


Pan2            two channel equal power pan

Pan2.ar(in, pos, level)


LFNoise1                ramp noise

LFNoise1.ar(freq, mul, add)
LFNoise1.kr(freq, mul, add


EnvGen              envelope generator

Inherits from: Object : AbstractFunction : UGen

Plays back break point envelopes. The envelopes are instances of the Env class. See the Env for more info. The arguments for levelScale, levelBias, and timeScale are polled when the EnvGen is triggered and remain constant for the duration of the envelope.

*ar(envelope, gate, levelScale, levelBias, timeScale, doneAction)
*kr(envelope, gate, levelScale, levelBias, timeScale, doneAction)


*perc(attackTime, releaseTime, peakLevel, curve)

    Creates a new envelope specification which (usually) has a percussive shape.
    attackTime - the duration of the attack portion.
    releaseTime - the duration of the release portion.
    peakLevel - the peak level of the envelope.
    curve - the curvature of the envelope.