shaker

shaker — Sounds like the shaking of a maraca or similar gourd instrument.

Description

Audio output is a tone related to the shaking of a maraca or similar gourd instrument. The method is a physically inspired model developed from Perry Cook, but re-coded for Csound.

Syntax

ares shaker kamp, kfreq, kbeans, kdamp, ktimes [, idecay]

Initialization

idecay -- If present indicates for how long at the end of the note the shaker is to be damped. The default value is zero.

Performance

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

kamp -- Amplitude of note.

kfreq -- Frequency of note played.

kbeans -- The number of beans in the gourd. A value of 8 seems suitable,

kdamp -- The damping value of the shaker. Values of 0.98 to 1 seems suitable, with 0.99 a reasonable default.

ktimes -- Number of times shaken.

[Note] Note

The argument knum was redundant, so it was removed in version 3.49.

Examples

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

Example 348. Example of the shaker opcode.

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

; Instrument #1
instr 1
   a1 shaker 10000, 440, 8, 0.999, 100, 0
   out a1
endin
/* shaker.orc */

        
/* shaker.sco */
i 1 0 1
e
/* shaker.sco */

        

Credits

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

New in Csound version 3.47

Fixed the example thanks to a message from Istvan Varga.