STKWhistle
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## STKWhistle

STKWhistle — STKWhistle produces whistle sounds.

## Description

STKWhistle produces (police) whistle sounds. It uses a hybrid physical/spectral model of a police whistle (a la Cook).

## Syntax

    asignal STKWhistle ifrequency, iamplitude, [kc1, kv1[, kc2, kv2[, kc3, kv3[, kc4, kv4[, kc5, kv5]]]]]

## Initialization

ifrequency -- Frequency of note played, in Hertz.

iamplitude -- Amplitude of note played (range 0-1).

## Performance

kc1, kv1, kc2, kv2, kc3, kv3, kc4, kv4, kc5, kv5, kc6, kv6, kc7, kv7, kc8, kv8 -- Up to 8 optional k-rate controller pairs for the STK opcodes. Each controller pair consists of a controller number (kc) followed by a controller value (kv). The 5 controller numbers and values that work for STKWhistle are:

- kc, kv -- 2, blowing frequency modulation.

- kc, kv -- 4, noise gain.

- kc, kv -- 11, fipple modulation frequency.

- kc, kv -- 1, fipple modulation gain.

- kc, kv -- 128, volume.

| Note
The code for this opcode is taken directly from the Whistle class in the Synthesis Toolkit in C++ by Perry R. Cook and Gary P. Scavone. More on the STK classes can be found here: https://ccrma.stanford.edu/software/stk/classes.html

## Examples

Here is an example of the STKWhistle opcode. It uses the file STKWhistle.csd.

Example 823. Example of the STKWhistle opcode.

    <CsoundSynthesizer>
    <CsOptions>
    ; Select audio/midi flags here according to platform
    -odac     ;;;RT audio out
    ;-iadc    ;;;uncomment -iadc if RT audio input is needed too
    ; For Non-realtime ouput leave only the line below:
    ; -o STKWhistle.wav -W ;;; for file output any platform
    </CsOptions>
    <CsInstruments>

    sr = 44100
    ksmps = 32
    nchnls = 2
    0dbfs = 1

    instr 1

    ifrq	=	p4
    kblw	line	p5, p3, p6				;Blowing Frequency Modulation
    kflp	=	p7					;Fipple Modulation Frequency

    asig	STKWhistle cpspch(p4), 1, 4, 20, 11, kflp, 1, 100, 2, kblw, 128, 127
    asig	=	asig*.7				;too loud
    	outs asig, asig
    endin

    </CsInstruments>
    <CsScore>

    i 1 0 .5 9.00 100 30 30
    i 1 1 3  9.00 100  0 20
    i 1 4.5 . 9.00 1  0 100
    e
    </CsScore>
    </CsoundSynthesizer>

## Credits

Author: Michael Gogins (after Perry Cook)
Irreducible Productions
New York, NY

New in Csound version 5.11

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