STKWurley — STKWurley simulates a Wurlitzer electric piano FM synthesis instrument.


Plugin opcode in stkopd.

STKWurley simulates a Wurlitzer electric piano FM synthesis instrument. It uses two simple FM Pairs summed together, also referred to as algorithm 5 of the TX81Z.


asignal STKWurley ifrequency, iamplitude, [kmod, kv1[, kcross, kv2[, klfo, kv3[, klfodepth, kv4[, kadsr, kv5]]]]]


ifrequency -- Frequency of note played, in Hertz.

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


kmod -- controller 2, modulator index 1. Value range of kv1 is 0-127.

kcross -- controller 4, crossfade of outputs. Value range of kv2 is 0-127.

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

klfodepth -- controller1, depth of low-frequency oscillator. Value range of kv4 is 0-127.

kadsr -- controller 128, ADSR 2 and 4 target. Value range of kv5 is 0-127.

[Note] Note

The code for this opcode is taken directly from the Wurley 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 STKWurley opcode. It uses the file STKWurley.csd.

Example 1025. Example of the STKWurley 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 STKWurley.wav -W ;;; for file output any platform

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

instr 1

ifrq	=	p4
kv1	line	p5, p3, p6				;(FM) Modulator Index One
kv3	=	p7

asig	STKWurley cpspch(p4), 1, 2,kv1, 4, 10, 11, kv3, 1, 30, 128, 75
	outs asig, asig


i 1 0 .5 7.00 75  0  20
i 1 + .  8.00 120 0  20
i 1 + 1  6.00 50 120 20
i 1 + 4  8.00 10 10  127

See Also



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

New in Csound version 5.11