STKPercFlut
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## STKPercFlut

STKPercFlut — STKPercFlut is a percussive flute FM synthesis instrument.

## Description

Plugin opcode in stkopd. This opcode is part of the plugin repository and has to be installed separately. The plugin repository can be found here: https://github.com/csound/plugins

STKPercFlut is a percussive flute FM synthesis instrument. The instrument uses an algorithm like the algorithm 4 of the TX81Z.

## Syntax

    asignal STKPercFlut ifrequency, iamplitude, [kmod, kv1[, kcross, kv2[, klfo, kv3[, klfodepth, kv4[, kadsr, kv5]]]]]

## Initialization

ifrequency -- Frequency of note played, in Hertz.

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

## Performance

kmod -- controller 2, total modulator index. Value range of kv1 is 0-127.

kcross -- controller 4, crossfade of modulator. Value range of kv2 is 0-127.

klfo -- controller 11, speed of low-frequency oscillator. Value range of kv3 is 0-127.

klfodepth -- controller 1, depth of low-frequency oscillator. Value range of kv4 is 0-127.

kadsr -- controller 128, ADSR 2 and 4 target. Value range of kv5 is 0-127.

| Note
The code for this opcode is taken directly from the PercFlut 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 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). Both the controller numbers and the controller values are krate variables. However, during a performance, normally the controller numbers stay fixed while the corresponding controller values may change at any time. The order of the controller pair is arbitrary, as long as they are after iamplitude. Also, it is not needed that all controller pairs are used.

## Examples

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

Example 1025. Example of the STKPercFlut opcode.

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

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

    instr 1

    ifrq	=	p4
    kv1	line	p5, p3, p6				;Total Modulator Index
    kv2	line	p7, p3, 0				;Modulator Crossfade

    asig	STKPercFlut cpspch(ifrq), 1, 2, kv1, 4, kv2, 11, 0, 1, 100, 128, 40
    	outs asig, asig
    endin

    </CsInstruments>
    <CsScore>
    i 1 0 7  8.05 100 0  100
    i 1 3 7   9.03 20 120  0
    i 1 3 .5  8.05 20 120  0
    i 1 4 .5  9.09 20 120  0
    i 1 5 3   9.00 20 120  0

    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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