rezzy
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## rezzy

rezzy — A resonant low-pass filter.

## Description

A resonant low-pass filter.

## Syntax

    ares rezzy asig, xfco, xres [, imode, iskip]

## Initialization

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)

## Performance

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.

## Examples

Here is an example of the rezzy opcode. It uses the file rezzy.csd.

Example 766. Example of the rezzy opcode.

See the sections Real-time Audio and Command Line Flags for more information on using command line flags.

    <CsoundSynthesizer>
    <CsOptions>
    ; Select audio/midi flags here according to platform
    -odac   ;;;realtime audio out
    ;-iadc    ;;;uncomment -iadc if realtime audio input is needed too
    ; For Non-realtime ouput leave only the line below:
    ; -o rezzy.wav -W ;;; for file output any platform
    </CsOptions>
    <CsInstruments>

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

    instr 1

    asaw vco2 .3, 110	;sawtooth
    kcf  line 1760, p3, 220	;vary cut-off frequency from 220 to 1280 Hz
    kres = p4		;vary resonance too
    ares rezzy asaw, kcf, kres
    asig balance ares, asaw
         outs asig, asig

    endin
    </CsInstruments>
    <CsScore>

    i 1 0 4 10
    i 1 + 4 30
    i 1 + 4 120	;lots of resonance
    e
    </CsScore>
    </CsoundSynthesizer>

## See Also

biquad, moogvcf

## Credits

Author: Hans Mikelson
October 1998

New in Csound version 3.49

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