The Roland PH830 is a stereo phaser pedal designed for guitar and bass players. It is a classic analog phaser pedal that uses two all-pass filters to create a sweeping, swooshing sound. It has a wide range of controls, including a Rate knob to adjust the speed of the phaser, a Depth knob to adjust the intensity of the effect, and a Resonance knob to adjust the feedback of the effect. It also has a Dry/Wet knob to adjust the mix of the dry and wet signals.
The Roland PH830 has been used by many famous guitarists, including Eddie Van Halen, Joe Satriani, and Steve Vai. It is a great tool for creating unique and interesting sounds, and it is a popular choice for guitarists looking to add a classic phaser effect to their sound.