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# gogobel

gogobel -- Audio output is a tone related to the striking of a cow bell or similar.

## Description

Audio output is a tone related to the striking of a cow bell or similar. The method is a physical model developed from Perry Cook, but re-coded for Csound.

## Syntax

ar gogobel kamp, kfreq, ihrd, ipos, imp, kvibf, kvamp, ivfn

## Initialization

ihrd -- the hardness of the stick used in the strike. A range of 0 to 1 is used. 0.5 is a suitable value.

ipos -- where the block is hit, in the range 0 to 1.

imp -- a table of the strike impulses. The file marmstk1.wav is a suitable function from measurements and can be loaded with a GEN01 table. It is also available at ftp://ftp.cs.bath.ac.uk/pub/dream/documentation/sounds/modelling/.

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

## Performance

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

kamp -- Amplitude of note.

kfreq -- Frequency of note played.

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

kvamp -- amplitude of the vibrato

## Examples

Here is an example of the gogobel opcode. It uses the files gogobel.orc, gogobel.sco, and marmstk1.wav,

Example 1. Example of the gogobel opcode.

    /* gogobel.orc */
    ; Initialize the global variables.
    sr = 22050
    kr = 2205
    ksmps = 10
    nchnls = 1

    ; Instrument #1.
    instr 1
      ; kamp = 31129.60
      ; kfreq = 440
      ; ihrd = 0.5
      ; ipos = 0.561
      ; imp = 1
      ; kvibf = 6.0
      ; kvamp = 0.3
      ; ivfn = 2

      a1 gogobel 31129.60, 440, 0.5, 0.561, 1, 6.0, 0.3, 2
      out a1
    endin
    /* gogobel.orc */

    /* gogobel.sco */
    ; Table #1, the "marmstk1.wav" audio file.
    f 1 0 256 1 "marmstk1.wav" 0 0 0
    ; Table #2, a sine wave for the vibrato.
    f 2 0 128 10 1

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