vibes
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## vibes

vibes — Physical model related to the striking of a metal block.

## Description

Audio output is a tone related to the striking of a metal block as found in a vibraphone. The method is a physical model developed from Perry Cook, but re-coded for Csound.

## Syntax

    ares vibes kamp, kfreq, ihrd, ipos, imp, kvibf, kvamp, ivibfn, idec

## 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

idec -- time before end of note when damping is introduced

idoubles (optional) -- percentage of double strikes. Default is 40%.

itriples (optional) -- percentage of triple strikes. Default is 20%.

## Performance

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 vibes opcode. It uses the file vibes.csd, and marmstk1.wav.

Example 882. Example of the vibes 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
    ; Audio out   Audio in    No messages
    -odac           -iadc     -d     ;;;RT audio I/O
    ; For Non-realtime ouput leave only the line below:
    ; -o vibes.wav -W ;;; for file output any platform
    </CsOptions>
    <CsInstruments>

    ; Initialize the global variables.
    sr = 44100
    ksmps = 10
    nchnls = 2

    ; Instrument #1.
    instr 1
      ; kamp = 20000
      ; kfreq = 440
      ; ihrd = 0.5
      ; ipos = p4
      ; imp = 1
      ; kvibf = 6.0
      ; kvamp = 0.05
      ; ivibfn = 2
      ; idec = 0.1
    asig	vibes	20000, 440, .5, p4 , 1, 6.0, 0.05, 2, .1
    	outs		asig, asig
    endin

    </CsInstruments>
    <CsScore>

    ; 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 four seconds.
    i 1 0 4 0.561
    i 1 + 4 1
    e

    </CsScore>
    </CsoundSynthesizer>

## See Also

marimba

## Credits

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

New in Csound version 3.47

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