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

Examples

Here is an example of the shaker opcode. Play shaker.csd

<CsoundSynthesizer>
<CsOptions>
; Select audio/midi flags here according to platform
; Audio out   Audio in
-odac             ;;;RT audio out
; For Non-realtime ouput leave only the line below:
; -o shaker.wav -W ;;; for file output any platform
</CsOptions>
<CsInstruments>

; by Menno Knevel

sr = 44100
ksmps = 32
nchnls = 2
0dbfs  = 1

instr 1

knum  =   p5
kfreq	line p4, p3, 440
a1 shaker .5, kfreq, 8, 0.999, knum
outs a1, a1

endin

</CsInstruments>
<CsScore>
;       frq     #
i 1 0 1 440     3
i 1 2 1 440    300
i 1 4 1 440    3000
i 1 6 2 4000    100

</CsScore>
</CsoundSynthesizer>

Credits

New in Csound version 3.47