imode (optional, default=0) -- high-pass or low-pass mode. If zero, rezzy is low-pass. If not zero, rezzy is high-pass. Default value is 0. (New in Csound version 3.50)
asig -- input signal
xfco -- filter cut-off frequency in Hz. As of version 3.50, may i-,k-, or a-rate.
xres -- amount of resonance. Values of 1 to 100 are typical. Resonance should be one or greater. As of version 3.50, may a-rate, i-rate, or k-rate.
rezzy is a resonant low-pass filter created empirically by Hans Mikelson.
Here is an example of the rezzy opcode. It uses the files rezzy.orc and rezzy.sco.
Example 1. Example of the rezzy opcode.
/* rezzy.orc */
; Initialize the global variables.
sr = 44100
kr = 4410
ksmps = 10
nchnls = 1
; Instrument #1.
instr 1
; Use a nice sawtooth waveform.
asig vco 32000, 220, 1
; Vary the filter-cutoff frequency from .2 to 2 KHz.
kfco line 200, p3, 2000
; Set the resonance amount.
kres init 25
a1 rezzy asig, kfco, kres
out a1
endin
/* rezzy.orc */
/* rezzy.sco */
; Table #1, a sine wave for the vco opcode.
f 1 0 16384 10 1
; Play Instrument #1 for three seconds.
i 1 0 3
e
/* rezzy.sco */