The Boss PH-3 is a pedal that has a collection of both vintage and modern phaser effects. The Rise and Fall mode for unidirectional phasing. The PH-3 also features a classic multi-stage phaser where you can select internships. An expression pedal can be used to use the Temp, Filter, and Rate properties in real time. You can control your sound with the Rate, Depth, Res, and Stage buttons.