Check the listing for details. Walrus Audio Fundamental Series: Phaser Effects Pedal Black. Condition: New. Listed at 99.99 USD. The Fundamental Series Phaser effects pedal from Walrus Audio delivers the tonal integrity required to live on a professional's pedalboard, but with simplified controls that are friendly enough even for players who are new to effects pedals. The phaser pedal includes three sliders for tweaking the sound, plus a three-way switch for changing pedal modes (Light, Medium, Heavy). This versatile pedal will keep you covered from your first band practice all the way to a sold-out arena.