Synth Glossary

Filter:: A filter filters out certain frequencies in the sound. There are four main types: a low-pass, high-pass, band-pass and notch, which are covered elseware in the glossary. Filters have two controls - the frequency control selects at which frequency the filter should start operating and the resonance control creates a peak just before the bit where it starts filtering out frequencies. This is used to create acid-type sounds....

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"Oberheim released the polyphonic and programmable OB-X in 1979. Available in four-, six-, and eight-voice configurations, it offered 32 program memories, polyphonic portamento, and polyphonic sample-and-hold."

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