This time, done with classic all pass filters like in the Bad Stone and Small Stone pedals.

Update: A complete rebuild with different design and two separate phaser circuits. Optimized for great sound.
When both phasers are used, the stereo width between the two can be adjusted over a wide range.

Hit play to start tweaking.
Connect the Phaser-XL4 rack input to your audio source in order to use it with your own instrument.