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"The Sigma is a unique synth for it's time. It offers two sections: "Synth" section, and preset "Instrument" section. These can be played independent or layered! 19 total presets with some ability to modify your tone. 11 presets in the "instrument section including: electric bass, tuba, clavi, fuzz guitar, horn, trumpet, clarinet, double reed, string, flute and hammered percussion.. 8 presets on the synthe side for all sorts of waveforms in different pitch ranges from 32'-4'.Joysticks add multi-dimensional control. Use one to control pitch, noise and vibrato and use the second joystick to edit the low-pass and hi-pass voltage controlled filters! There is also an "Effect" section which is for Vibrato, Portamento, Sample and Hold, Noise, Key Hold, Multiple Trigger and Ring Modulator (each with it's own rotary control to vary it's sound). Even though it has a switch labelled 'Ring Mod,' it's actually a cross-mod. It lets you cross modulate between the instrument and Synth sections."
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