A very low sine wave made to be phase modulated by complicated signal like vocals. Simply play your vocals into this device and mix to taste.

Based on Nest Acoustics' recent video demonstrating how to use vocals as a modulator while still receiving a musical result

A Recreation of Phase Plant utilizing Bitwig's layer containers. The main instrument layer is your oscillator section and the Fx layer contains your 3 lanes. These lanes are setup in series by default but there is a simple button macro to split them into parallel lanes (NOTE: you will have to reroute the audio receivers in parallel). If you want to do any kind of poly modulation its going to need to happen within each individual "oscillator" layer, you cannot use poly modulators within the fx main fx section.

a janky little recreation of phase plant using bitwigs layer devices