STKFMVoices
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## STKFMVoices

STKFMVoices — STKFMVoices is a singing FM synthesis instrument.

## Description

Plugin opcode in stkopd.

STKFMVoices is a singing FM synthesis instrument. It has 3 carriers and a common modulator, also referred to as algorithm 6 of the TX81Z.

## Syntax

    asignal STKFMVoices ifrequency, iamplitude, [kvowel, kv1[, kspec, kv2[, klfo, kv3[, klfodepth, kv4[, kadsr, kv5]]]]]

## Initialization

ifrequency -- Frequency of note played, in Hertz.

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

## Performance

kvowel -- controller 2, vowel. Value range of kv1 is 0-127.

kspec -- controller 4, spectral tilt. 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 FMVoices 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 STKFMVoices opcode. It uses the file STKFMVoices.csd.

Example 980. Example of the STKFMVoices 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 STKFMVoices.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					;vowel
    kv2	line	p7, p3, p8					;specral tilt

    asig	STKFMVoices cpspch(ifrq), 1, 2, kv1, 4, kv2, 11, 10, 1, 10, 128, 50
    asig	=	asig * 4					;amplify
    	outs asig, asig
    endin

    </CsInstruments>
    <CsScore>

    i 1 0 5 5.00 10 120 0 0
    i 1 + 2 8.00 80 82 127 0
    e
    </CsScore>
    </CsoundSynthesizer>

## See Also

STKBeeThree.

## Credits

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

New in Csound version 5.11

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