STKVoicForm
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## STKVoicForm

STKVoicForm — STKVoicForm is a four formant synthesis instrument.

## Description

STKVoicForm is a four formant synthesis instrument. This instrument contains an excitation singing wavetable (looping wave with random and periodic vibrato, smoothing on frequency, etc.), excitation noise, and four sweepable complex resonances. Measured formant data is included, and enough data is there to support either parallel or cascade synthesis. In the floating point case cascade synthesis is the most natural so that's what you'll find here.

## Syntax

    asignal STKVoicForm 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 STKVoicForm are:

- kc, kv -- 2, voiced/unvoiced mix.

- kc, kv -- 4, vowel/phoneme selection.

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

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

- kc, kv -- 128, loudness (spectral tilt).

| Note
The code for this opcode is taken directly from the VoicForm 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 STKVoicForm opcode. It uses the file STKVoicForm.csd.

Example 788. Example of the STKVoicForm 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 STKVoicForm.wav -W ;;; for file output any platform
    </CsOptions>
    <CsInstruments>

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

    instr 1

    ifrq	=	p4
    ksel	line	p5, p3, p6				;Vowel/Phoneme Selection

    asig	STKVoicForm cpspch(p4), 1, 2, 1, 4, ksel, 128, 100, 1, 10, 11, 100
    asig	=	asig * .5				;too loud
    	outs asig, asig
    endin

    </CsInstruments>
    <CsScore>

    i 1 0 5  7.00 100 0
    i 1 + 10 7.00 1  50
    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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