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# wgflute

wgflute -- Creates a tone similar to a flute.

## Description

Audio output is a tone similar to a flute, using a physical model developed from Perry Cook, but re-coded for Csound.

## Syntax

ar wgflute kamp, kfreq, kjet, iatt, idetk, kngain, kvibf, kvamp, ifn [, iminfreq] [, ijetrf] [, iendrf]

## Initialization

iatt -- time in seconds to reach full blowing pressure. 0.1 seems to correspond to reasonable playing.

idetk -- time in seconds taken to stop blowing. 0.1 is a smooth ending

ifn -- table of shape of vibrato, usually a sine table, created by a function

iminfreq (optional) -- lowest frequency at which the instrument will play. If it is omitted it is taken to be the same as the initial kfreq. If iminfreq is negative, initialization will be skipped.

ijetrf (optional, default=0.5) -- amount of reflection in the breath jet that powers the flute. Default value is 0.5.

iendrf (optional, default=0.5) -- reflection coefficient of the breath jet. Default value is 0.5. Both ijetrf and iendrf are used in the calculation of the pressure differential.

## Performance

kamp -- Amplitude of note.

kfreq -- Frequency of note played. While it can be varied in performance, I have not tried it.

kjet -- a parameter controlling the air jet. Values should be positive, and about 0.3. The useful range is approximately 0.08 to 0.56.

kngain -- amplitude of the noise component, about 0 to 0.5

kvibf -- frequency of vibrato in Hertz. Suggested range is 0 to 12

kvamp -- amplitude of the vibrato

## Examples

Here is an example of the wgflute opcode. It uses the files wgflute.orc and wgflute.sco.

Example 1. Example of the wgflute opcode.

    /* wgflute.orc */
    ; Initialize the global variables.
    sr = 44100
    kr = 4410
    ksmps = 10
    nchnls = 1

    ; Instrument #1.
    instr 1
      kamp = 31129.60
      kfreq = 440
      kjet = 0.32
      iatt = 0.1
      idetk = 0.1
      kngain = 0.15
      kvibf = 5.925
      kvamp = 0.05
      ifn = 1

      a1 wgflute kamp, kfreq, kjet, iatt, idetk, kngain, kvibf, kvamp, ifn
      out a1
    endin
    /* wgflute.orc */

    /* wgflute.sco */
    ; Table #1, a sine wave.
    f 1 0 16384 10 1

    ; Play Instrument #1 for two seconds.
    i 1 0 2
    e
    /* wgflute.sco */

## Credits

Author: John ffitch (after Perry Cook)
University of Bath, Codemist Ltd.
Bath, UK

New in Csound version 3.47

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