SubTractor Analog Synthesizer
The SubTractor Analog Synthesizer is a software synthesizer included in the Propellerhead Reason software package, based around subtractive synthesis: two oscillators generate "raw" waveforms (sine wave, sawtooth wave, square wave, triangle wave or 27 custom waveforms with various timbres), which are then passed through several audio filters to alter the final result. SubTractor is capable of phase offset modulation, a technique which allows the generation of many effects similar to, and including, pulse-width modulation. Apart from The Two main oscillators, the SubTractor also contains a noise generator, two filters (high-pass, low-pass, band-pass and notch), 2 LFOs and several ADSR envelopes. The SubTractor is monaural and has 99-voice polyphony. The subtractor is the only device in Reason whereby the user is able to loosen and remove the four outside screws.