STKBrass — STKBrass is a simple brass 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:

STKBrass uses a simple brass instrument waveguide model, a la Cook.


asignal STKBrass ifrequency, iamplitude, [klip, kv1[, kslide, kv2[, klfo, kv3[, klfodepth, kv4[, kvol, kv5]]]]]


ifrequency -- Frequency of note played, in Hertz.

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


klip -- controller 2, lip tension. Value range of kv1 is 0-127.

kslide -- controller 4, slide length. 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.

kvol -- controller 128, volume. Value range of kv5 is 0-127.

[Note] Note

The code for this opcode is taken directly from the Brass 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 STKBrass opcode. It uses the file STKBrass.csd.

Example 1038. Example of the STKBrass 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 STKBrass.wav -W ;;; for file output any platform

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

instr 1

ifrq	=	p4
kv1	line	p5, p3, p6					;lip tension
kv3	line	p7, p3, p8					;speed of low-frequency oscillator

asig	STKBrass cpspch(ifrq), 1, 2, kv1, 4, 100, 11, kv3, 1, 10, 128, 40
asig	=	asig *3						;amplify
	outs asig, asig


i 1 0 2 8.05 100 120 50 0 
i 1 + 3 9.00  80 82 10 0

See also

STK Opcodes


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

New in Csound version 5.11