STKSimple — STKSimple is a wavetable/noise instrument.


Plugin opcode in stkopd. This opcode is part of the plugin repository and has to be installed separately. The plugin repository can be found here:

STKSimple is a wavetable/noise instrument. It combines a looped wave, a noise source, a biquad resonance filter, a one-pole filter, and an ADSR envelope to create some interesting sounds.


asignal STKSimple ifrequency, iamplitude, [kpos, kv1[, kcross, kv2[, kenv, kv3[, kgain, kv4]]]]


ifrequency -- Frequency of note played, in Hertz.

iamplitude -- Amplitude of note played (range 0-1).


kpos -- controller 2, position of filter pole. Value range of kv1 is 0-127.

kcross -- controller 4, noise/pitched cross-fade. Value range of kv2 is 0-127.

kenv -- controller 11, rate of envelope. Value range of kv3 is 0-127.

kgain -- controller 128, gain. Value range of kv4 is 0-127.

[Note] Note

The code for this opcode is taken directly from the Simple class in the Synthesis Toolkit in C++ by Perry R. Cook and Gary P. Scavone. More on the STK classes can be found here:

kc1, kv1, kc2, kv2, kc3, kv3, kc4, kv4, kc5, kv5, kc6, kv6, kc7, kv7, kc8, kv8 -- Up to 8 optional k-rate controller pairs for the STK opcodes. Each controller pair consists of a controller number (kc) followed by a controller value (kv). Both the controller numbers and the controller values are krate variables. However, during a performance, normally the controller numbers stay fixed while the corresponding controller values may change at any time. The order of the controller pair is arbitrary, as long as they are after iamplitude. Also, it is not needed that all controller pairs are used.


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

Example 1053. Example of the STKSimple opcode.

; Select audio/midi flags here according to platform
-odac     ;;;realtime audio out
;-iadc    ;;;uncomment -iadc if RT audio input is needed too
; For Non-realtime ouput leave only the line below:
; -o STKSimple.wav -W ;;; for file output any platform

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

instr 1

ifrq	=	p4
kv1	line	p5, p3, p6				;Filter Pole Position
kv2	line	20, p3, 90				;Noise/Pitched Cross-Fade

asig	STKSimple cpspch(p4), 1, 2, kv1, 4, kv2, 11, 10, 128, 120
	outs asig, asig


i 1 0 5 7.00 100 0
i 1 + .  7.05 10 127
i 1 + .  8.03 100 0
i 1 + .  5.00 10 10

See also

STK Opcodes


Author: Michael Gogins (after Perry Cook)
Irreducible Productions
New York, NY

New in Csound version 5.11