STKBandedWG — STKBandedWG uses banded waveguide techniques to model a variety of sounds.


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:

This opcode uses banded waveguide techniques to model a variety of sounds, including bowed bars, glasses, and bowls.


asignal STKBandedWG ifrequency, iamplitude, [kpress, kv1[, kmot, kv2[, klfo, kv3[, klfodepth, kv4[, kvel, kv5[, kstrk, kv6[, kinstr, kv7]]]]]]]


ifrequency -- Frequency of note played, in Hertz.

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


kpress -- controller 2, pressure of bow. Value range of kv1 is 0-127.

kmot -- controller 4, motion of bow. Value range of kv2 is 0-127.

klfo -- controller 11, speed of low-frequency oscillator. Value range of kv3 is 0-127.

klfodepth -- controller 1, depth of low-frequency oscillator. Value range of kv4 is 0-127.

kvel -- controller 128, velocity of bow. Value range of kv5 is 0-127.

kstrk -- controller 64, striking of bow. Value range of kv6 is 0-127.

kinstr -- controller 16, instrument presets (0 = uniform bar, 1 = tuned bar, 2 = glass harmonica, 3 = Tibetan bowl). Value range of kv7 is 0-3.

[Note] Notes

The code for this opcode is taken directly from the BandedWG 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 STKBandedWG opcode. It uses the file STKBandedWG.csd.

Example 1010. Example of the STKBandedWG 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 STKBandedWG.wav -W ;;; for file output any platform

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

instr 1

ifrq =    p4
kv1  line p5, p3, p6					;pressure of bow
kenv line 1, p3, 0

asig STKBandedWG cpspch(ifrq), 1, 2, kv1, 4, 100, 11, 0, 1, 0, 64, 100, 128, 120, 16, 2
asig = asig * kenv					;simple envelope
     outs asig, asig


i 1 0 10 5.00 100 0
i 1 10 8 6.03 10 .
i 1 20 5 7.05 50 127



Author: Michael Gogins (after Georg Essl)
Irreducible Productions
New York, NY

New in Csound version 5.11