Complex sentence: It contains three separate synthesis engines, AddSynth, SubSynth, and PADSynth; any single patch can use one or all, and a single setup or instance can contain anywhere from one to sixty-four possible patches.
Split into simpler sentences: It contains three separate synthesis engines, AddSynth, SubSynth, and PADSynth; any single patch can use one or all. A complete setup or instance can contain anywhere from one to sixty-four possible patches.