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# sandpaper

sandpaper -- Semi-physical model of a sandpaper sound.

## Description

sandpaper is a semi-physical model of a sandpaper sound. It is one of the PhISEM percussion opcodes. PhISEM (Physically Informed Stochastic Event Modeling) is an algorithmic approach for simulating collisions of multiple independent sound producing objects.

## Syntax

ar sandpaper iamp, idettack [, inum] [, idamp] [, imaxshake]

## Initialization

iamp -- Amplitude of output. Note: As these instruments are stochastic, this is only a approximation.

idettack -- period of time over which all sound is stopped

inum (optional) -- The number of beads, teeth, bells, timbrels, etc. If zero, the default value is 128.

idamp (optional) -- the damping factor, as part of this equation:

damping_amount = 0.998 + (idamp * 0.002)

The default damping_amount is 0.999 which means that the default value of idamp is 0.5. The maximum damping_amount is 1.0 (no damping). This means the maximum value for idamp is 1.0.

The recommended range for idamp is usually below 75% of the maximum value.

imaxshake (optional) -- amount of energy to add back into the system. The value should be in range 0 to 1.

## Examples

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

Example 1. Example of the sandpaper opcode.

    /* sandpaper.orc */
    ;orchestra ---------------

      sr =           44100
      kr =            4410
      ksmps =              10
      nchnls =               1

    instr 01                  ;an example of sandpaper blocks
      a1      line 2, p3, 2                             ;preset amplitude increase
      a2      sandpaper p4, 0.01            ;sandpaper needs a little amp help at these settings
      a3      product a1, a2                               ;increase amplitude
              out a3
              endin
    /* sandpaper.orc */

    /* sandpaper.sco */
    ;score -------------------

       i1 0 1 26000
       e
    /* sandpaper.sco */

## See Also

cabasa, crunch, sekere, stix

## Credits

Author: Perry Cook, part of the PhOLIES (Physically-Oriented Library of Imitated Environmental Sounds)
Adapted by John ffitch
University of Bath, Codemist Ltd.
Bath, UK

New in Csound version 4.07

Added notes by Rasmus Ekman on May 2002.

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