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


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.


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


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


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.


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

Example 791. Example of the shaker opcode.

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

; 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 shaker.wav -W ;;; for file output any platform

; Initialize the global variables.
sr = 44100
kr = 4410
ksmps = 10
nchnls = 1

; Instrument #1
instr 1
kfreq	line p4, p3, 440
   a1 shaker 10000, kfreq, 8, 0.999, 100, 0
   out a1


i 1 0 1 440
i 1 + 1 4000



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.