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KeyboardMag.com >> This Month >> Creating Phase-shift Effects With Filters.
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Access Virus C and TI Creating phase-shift effects with filters.January, 2006We all understand how filters work — they allow some frequencies to pass while stopping others and most can generate resonant peaks as well. But it’s a little-known fact that there’s something else going on, too: frequency-dependent phase shifting. It’s part of the sound, but it’s way in the background. On the Virus, you can use overlaid filter curves to exploit this phenomenon, make it more audible than usual, and produce some cool effects with it. 1. Dial up a sawtooth-based sound; the rich harmonics give the filters lots to chew on, and that helps our target phenomenon come to the surface. 2. Change the filter routing to “Parallel 4.” 3. Set one filter to lowpass and the other to highpass, bandpass, or band-stop, whichever strikes your fancy. 4. Move the Cutoff 2 knob. Hear that subtle-but-bizarre effect? What’s happening is Cutoff 2 is actually changing the offset between the frequencies of the two filters rather than directly controlling the cutoff of filter 2 the way it normally would. 5. Use an LFO, an envelope, or an arpeggiator pattern to modulate Cutoff 2 automatically and generate the phase-shifting effect. It’s quite cool applied to spiky comping sounds, arpeggiated parts, and especially lush pad sounds. |
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