STKFMVoices
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## STKFMVoices

STKFMVoices — STKFMVoices is a singing FM synthesis instrument.

## Description

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, [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 STKFMVoices are:

- kc, kv -- 2, vowel.

- kc, kv -- 4, spectral tilt.

- kc, kv -- 11, speed of low-frequency oscillator.

- kc, kv -- 1, depth of low-frequency oscillator.

- kc, kv -- 128, ADSR 2 and 4 Target.

| 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

## Examples

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

Example 773. Example of the STKFMVoices 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 STKFMVoices.wav -W ;;; for file output any platform
    </CsOptions>
    <CsInstruments>

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

    instr 1

    ifrq	=	p4
    kjet	line	p5, p3, p6			;vowel
    ktlt	line	p7, p3, p8			;specral tilt

    asig	STKFMVoices cpspch(ifrq), 1, 2, kjet, 4, ktlt, 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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