The Filters

We have managed to create a wide variety of sounds using just oscillators and envelopes. But filters are important too.

Filters are the primary way the “raw” sound of a synthesizer’s oscillators is shaped into something interesting and useful.

Most synthesizers (including Evolver) use a “subtractive synthesis” method, where the basic oscillator sound is filtered, to remove (or subtract) frequencies from the basic sound to produce new timbres.

There are 4 basic types of filters — lowpass, highpass, bandpass, and band-reject. Evolver features lowpass and highpass filters. Bandpass filters can be created by placing a highpass and a lowpass filter one after the other, so it is possible to use both of Evolver’s filters to emulate a bandpass filter. “Band-reject” filters (also called notch filters) are like the reverse of bandpass filters — they remove a specific set of frequencies.

You may have heard about highpass and lowpass filters on other synthesizers, and how they really made a given synthesizer sound great. Does that mean Evolver’s lowpass and highpass filters sound just like those of synthesizer “X”? No. Every synthesizer’s filters are a little bit different. It’s like chocolate cake — everyone has their own “secret recipe” which provides a variation in flavor.

Дата добавления: 2015-08-20