wgbowedbar
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## wgbowedbar

wgbowedbar — A physical model of a bowed bar.

## Description

A physical model of a bowed bar, belonging to the Perry Cook family of waveguide instruments.

## Syntax

    ares wgbowedbar kamp, kfreq, kpos, kbowpres, kgain [, iconst] [, itvel] \
          [, ibowpos] [, ilow]

## Initialization

iconst (optional, default=0) -- an integration constant. Default is zero.

itvel (optional, default=0) -- either 0 or 1. When itvel = 0, the bow velocity follows an ADSR style trajectory. When itvel = 1, the value of the bow velocity decays in an exponentially.

ibowpos (optional, default=0) -- the position on the bow, which affects the bow velocity trajectory.

ilow (optional, default=0) -- lowest frequency required

## Performance

kamp -- amplitude of signal

kfreq -- frequency of signal

kpos -- position of the bow on the bar, in the range 0 to 1

kbowpres -- pressure of the bow (as in wgbowed)

kgain -- gain of filter. A value of about 0.809 is suggested.

## Examples

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

Example 989. Example of the wgbowedbar opcode.

See the sections Real-time Audio and Command Line Flags for more information on using command line flags.

    <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 wgbowedbar.wav -W ;;; for file output any platform
    </CsOptions>
    <CsInstruments>

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

    instr 1

    kp   = p6
    asig wgbowedbar p4, cpspch(p5), 1, kp, 0.995
         outs asig, asig

    endin
    </CsInstruments>
    <CsScore>
    s
    i1 0 .5 .5 7.00 .1	;short sound
    i1 + .  .3 8.00 .1
    i1 + .  .5 9.00 .1
    s
    i1 0 .5 .5 7.00  1	;longer sound
    i1 + .  .3 8.00  1
    i1 + .  .5 9.00  1

    e
    </CsScore>
    </CsoundSynthesizer>

## Credits

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

New in Csound version 4.07

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