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Two partials grouped together created a ''tone''. Tones could be modified using up to three [[low-frequency oscillator]]s, a pitch envelope, a programmable equalizer, and on-board effects such as reverberation and chorus. Two tones grouped together created a [[patch (synthesizer)|patch]].
In 1987, Roland also introduced Linear Arithmetic synthesis to the [[sound card]] [[computer music]] market, with the [[Roland MT-32]] [[sound module]].<ref>[http://www.synthmania.com/mt-32.htm MT-32], Synthmania</ref>
==Similar concepts==
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