Block - Quadrature LFO 1.0
Quad Phase-Shifted Sine LFO
Another Block in Michael Hetrick's "Euro Reakt" series!
A "Quadrature" oscillator is a sine oscillator that provides at least two outputs: sine and cosine. Many quadrature oscillators, like this LFO, provide 4 outputs: sine, cosine, -sine, and -cos. All of these outputs are frequency-locked. They are simply phase-shifted copies of the primary core.
This Quadrature LFO is based off of the Bento LFO. For this implementation, the saw output is used to address a sine table and a cosine table, providing the 0 and 90 degree outputs. Those outputs are inverted, providing the 180 and 270 degree outputs.
Quadrature LFOs are useful for creating modulations that chase each other, or for mirror modulations.
This Quadrature LFO is unique in that it retains the Bento LFO's "shape" parameter, allowing you to warp the lookup phasor. This creates really interesting push-pull modulations.