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) iskip (optional, default=0) -- if non zero skip the initialisation of the filter. (New in Csound version 4.23f13 and 5.0)
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 329. 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 */