lowresx
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## lowresx

lowresx — Simulates layers of serially connected resonant lowpass filters.

## Description

lowresx is equivalent to more layers of lowres with the same arguments serially connected.

## Syntax

    ares lowresx asig, xcutoff, xresonance [, inumlayer] [, iskip]

## Initialization

inumlayer -- number of elements in a lowresx stack. Default value is 4. There is no maximum.

iskip -- initial disposition of internal data space. A zero value will clear the space; a non-zero value will allow previous information to remain. The default value is 0.

## Performance

asig -- input signal

xcutoff -- filter cutoff frequency point

xresonance -- resonance amount

lowresx is equivalent to more layer of lowres with the same arguments serially connected. Using a stack of a larger number of filters allows a sharper cutoff. This is faster than using a larger number of instances of lowres in a Csound orchestra because only one initialization and k cycle are needed at time and the audio loop falls entirely inside the cache memory of processor. Based on an orchestra by Hans Mikelson

## Examples

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

Example 545. Example of the lowresx 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 lowresx.wav -W ;;; for file output any platform
    </CsOptions>
    <CsInstruments>

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

    instr 1

    kres = p4
    inumlayer = 4

    kenv linseg 0, p3*.1, 1, p3*.8, 1, p3*.1, 0 	;envelope
    asig vco .3 * kenv, 220, 1			;sawtooth
    kcut line 30, p3, 1000				;note: kcut is not in Hz
    alx  lowresx asig, kcut, kres, inumlayer	;note: kres is not in dB
    aout balance alx, asig				;avoid very loud sounds
         outs aout, aout

    endin
    </CsInstruments>
    <CsScore>
    ;sine wave
    f 1 0 16384 10 1

    i 1 0 5 1
    i 1 + 5 3
    i 1 + 5 20
    e
    </CsScore>
    </CsoundSynthesizer>

## See also

Standard Filters: Resonant Low-pass filters

## Credits

Author: Gabriel Maldonado (adapted by John ffitch)
Italy

New in Csound version 3.49

Audio rate parameters introduced in version 6.02

November 2013.

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