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# wgbrass

wgbrass -- Creates a tone related to a brass instrument.

## Description

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

## Syntax

ar wgbrass kamp, kfreq, ktens, iatt, kvibf, kvamp, ifn [, iminfreq]

## Initialization

iatt -- time taken to reach full pressure

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

iminfreq -- 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.

## Performance

A note is played on a brass-like instrument, with the arguments as below.

kamp -- Amplitude of note.

kfreq -- Frequency of note played.

ktens -- lip tension of the player. Suggested value is about 0.4

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

kvamp -- amplitude of the vibrato

| NOTE
| This is rather poor, and at present uncontrolled. Needs revision, and possibly more parameters.

## Examples

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

Example 1. Example of the wgbrass opcode.

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

    ; Instrument #1.
    instr 1
      kamp = 31129.60
      kfreq = 440
      ktens = 0.4
      iatt = 0.1
      kvibf = 6.137
      ifn = 1

      ; Create an amplitude envelope for the vibrato.
      kvamp line 0, p3, 0.5

      a1 wgbrass kamp, kfreq, ktens, iatt, kvibf, kvamp, ifn
      out a1
    endin
    /* wgbrass.orc */

    /* wgbrass.sco */
    ; Table #1, a sine wave.
    f 1 0 128 10 1

    ; Play Instrument #1 for one second.
    i 1 0 1
    e
    /* wgbrass.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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