STKVoicForm
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## STKVoicForm

STKVoicForm — STKVoicForm is a four formant synthesis instrument.

## Description

Plugin opcode in stkopd.

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 us what you will find here.

## Syntax

    asignal STKVoicForm ifrequency, iamplitude, [kmix, kv1[, ksel, kv2[, klfo, kv3[, klfodepth, kv4[, kloud, kv5]]]]]

## Initialization

ifrequency -- Frequency of note played, in Hertz.

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

## Performance

kmix -- controller 2, voiced/unvoiced mix. Value range of kv1 is 0-127.

ksel -- controller 4, vowel/phoneme selection. 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.

kloud -- controller 128, loudness (spectral tilt). Value range of kv5 is 0-127.

| 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 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 STKVoicForm opcode. It uses the file STKVoicForm.csd.

Example 1023. Example of the STKVoicForm 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 STKVoicForm.wav -W ;;; for file output any platform
    </CsOptions>
    <CsInstruments>

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

    instr 1

    ifrq	=	p4
    kv2	line	p5, p3, p6				;Vowel/Phoneme Selection

    asig	STKVoicForm cpspch(p4), 1, 2, 1, 4, kv2, 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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