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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An enhanced version of the OB-X, the OB-Xa also was "available in four-, six-, and eight-voice configurations, offered 32 program memories, polyphonic portamento, and polyphonic sample-and-hold", and in addition to that, it "offered the ability to split the keyboard, or double up the voices so that two voices would sound for each key that was depressed."

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