Reason 13 Operation Manual
A unique feature of the Subtractor oscillators is the ability to create an extra waveform within one oscillator, to offset the phase of that extra waveform, and to modulate this phase offset. By subtracting or multiplying a waveform with a phase offset copy of itself, very complex waveforms can be created. Sounds complicated? Well, the theory behind it might be, but from a user perspective it is just a method of generating new waveforms from existing waveforms.
When phase offset modulation is activated, the oscillator creates a second waveform of the same shape and offsets it by the amount set with the Phase knob. Depending on the selected mode, Subtractor then either subtracts or multiplies the two waveforms with each other. The resulting waveforms can be seen in the illustration below.
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Note that the Filter Frequency parameter is usually controlled by the Filter Envelope (see “Filter Envelope”) as well. Changing the Filter Frequency with the Freq slider may therefore not produce the expected result.
LFO 2 is polyphonic. This means that for every note you play, an independent LFO cycle is generated, whereas LFO 1 always modulates the destination parameter using the same “cycle”. This can be used to produce subtle cross-modulation effects, with several LFO cycles that “beat” against each other. This also enables LFO 2 to produce modulation rates that vary across the keyboard (see the “Keyboard Tracking” parameter below).