Joyo JF-328 Nebulous Phase Guitar Effects Pedal The JOYO “Nebulous” is a classic analogue phaser that gives you just a bit more control over your phased sound than the average old school phaser: In addition to Speed, you can also control Width and Feedback. Whether you want a slight movement in your lead sound or deep and watery phase sweeps for wide cleans, this tiny little box can do it all. Since it is all analogue, we obviously made it True Bypass!