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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

ar lowresx asig, kcutoff, kresonance [, 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

kcutoff -- filter cutoff frequency point

kresonance -- 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 files lowresx.orc, lowresx.sco, and beats.wav.

Example 1. Example of the lowresx opcode.

    /* lowresx.orc */
    ; Initialize the global variables.
    sr = 44100
    kr = 4410
    ksmps = 10
    nchnls = 1

    ; Instrument #1 - play the sawtooth waveform through a
    ; stack of filters.
    instr 1
      ; Use a nice sawtooth waveform.
      asig vco 5000, 440, 1

      ; Vary the cutoff frequency from 30 to 300 Hz.
      kcutoff line 30, p3, 300
      kresonance = 3
      inumlayer = 2

      alr lowresx asig, kcutoff, kresonance, inumlayer

      ; It gets loud, so clip the output amplitude to 30,000.
      a1 clip alr, 1, 30000
      out a1
    endin
    /* lowresx.orc */

    /* lowresx.sco */
    ; Table #1, a sine wave for the vco opcode.
    f 1 0 16384 10 1

    ; Play Instrument #1 for two seconds.
    i 1 0 2
    e
    /* lowresx.sco */

## See Also

lowres

## Credits

Author: Gabriel Maldonado (adapted by John ffitch)
Italy

New in Csound version 3.49

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