filter a sound: filter-sound, filter-channel, and clm-channel
filter the selection: filter-selection, filter-selection-and-smooth
CLM filter generators: filter, one-pole, formant, comb, notch, all-pass, etc
lowpass filter: make-lowpass in dsp.scm
highpass filter: make-highpass in dsp.scm
bandpass filter: make-bandpass in dsp.scm
bandstop filter: make-bandstop in dsp.scm
the usual analog filters (Butterworth, Chebyshev, Bessel, Elliptic): analog-filter.scm
Butterworth filters: make-butter-high-pass, make-butter-low etc in dsp.scm, used in new-effects.scm
IIR filters of various orders/kinds: dsp.scm
Hilbert transform: make-hilbert-transform in dsp.scm
differentiator: make-differentiator in dsp.scm
block DC: see example above, dc-block in prc95.scm, or stereo-flute in clm-ins.scm
hum elimination: see eliminate-hum and notch-channel in dsp.scm
hiss elimination: notch-out-rumble-and-hiss
smoothing filters: moving-average, weighted-moving-average, exponentially-weighted-moving-average
notch-filters: notch-channel and notch-selection
arbitrary spectrum via FIR filter: spectrum->coeffs in dsp.scm
invert an FIR filter: invert-filter in dsp.scm
filtered echo sound effect: flecho in examp.scm
time varying filter: fltit in examp.scm
draw frequency response: use envelope editor or filter control in control panel
Moog filter: moog.scm
Savitzky-Golay filter: savitzky-golay-filter
Click reduction: remove-clicks, clean-channel
FIR filter as virtual edit: virtual-filter-channel
LADSPA-based filter effects: see ladspa.scm
Max Mathews resonator: firmant, maxf.scm, maxf.rb
Spectral edit dialog: Envelope Editor
graphical equalizer filter bank: graphEq
nonlinear (Volterra) filter: volterra-filter
Kalman filter: kalman-filter-channel
see also convolution, physical modeling, reverb, and fft-based filtering
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