The Hex Phaser just might be the most powerful, most flexible stereo phaser every created for a modular synthesizer. Everything on it is adjustable, including both the number of active stages and the stage at which feedback is introduced. Rate, depth, bandwidth, and feedback amount are fully modulatable. The unique Stereo Offset control changes the phase relationship between the LFO for the left channel and the LFO for the right channel, and modulating this control can lead to phaser heaven.
Check out Hex Phaser in this video: https://youtu.be/c4I7LUy1_S0l.