PhaseShifter effects processor.
This unit emulates a common guitar pedal effect but without the LFO modulation.
You can use your own modulation source connected to the "offset" port.
Different frequencies are phase shifted varying amounts using a series of AllPass filters.
By feeding the output back to the input we can get varying phase cancellation.
This implementation was based on code posted to the music-dsp
archive by Ross Bencina.