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.
asig -- input signal
kcutoff -- filter cutoff frequency point
kresonance -- resonance amount
lowres is a resonant lowpass filter derived from a Hans Mikelson orchestra. This implementation is much faster than implementing it in Csound language, and it allows kr lower than sr. kcutoff is not in Hz and kresonance is not in dB, so experiment for the finding best results.
Here is an example of the lowres opcode. It uses the files lowres.orc, lowres.sco and beats.wav.
Example 15-1. Example of the lowres opcode.
/* lowres.orc */
; Initialize the global variables.
sr = 44100
kr = 4410
ksmps = 10
nchnls = 1
; Instrument #1.
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 = 10
; Apply the filter.
a1 lowres asig, kcutoff, kresonance
out a1
endin
/* lowres.orc */
/* lowres.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
/* lowres.sco */