Roland V-Synth Book page 19

SBF2 (SideBand Filter 2)
Similar to SBF1, but with stronger resonance.
COMB (Comb Filter)
Comb filters in general use several delay lines to boost or attenuate a series of frequencies. The filter frequencies in the V-Synth version
follow the harmonic series, so it can be used as a static effect to isolate or remove noise or to boost/attenuate partials within a waveform:
Removing / isolating the noise component of waves
Start from 512:INIT PATCH, select PCM for oscillator 1 and change the waveform to
086:F Ahs Mid. Go to COSM1, select COMB
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and Tone to 64 (the Thru position). Turn the P1 knob (which controls Tone) in the
COSM1 panel all the way down to isolate the noise component. Turn it up to remove
the noise i.e. all the inharmonic partials!
Adding / subtracting partials
Start from 512:INIT PATCH, select ANALOG for oscillator 1 and change the waveform to
SAW. Go to COSM1, select COMB, change the Octave to +1 and Tone to 64 (thru)
. Turn the P1 knob in the COSM1 panel all the way down to remove all the even-numbered
partials. The sound of the oscillator will now be very similar to HQ-SQR (which only contains
odd-numbered partials). Now try turning the P1 knob up - even-numbered partials are
emphasized and the sound, though very similar to the original wave (sawtooth) is now an
octave higher.
Of course the Tone parameter can be controlled in the Matrix (via the CSM1-PRM1
parameter). See "The Matrix - Assigning Destinations" below.
1 , change the Octave to 0 (zero) 2
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