The Phaser section provides control over the effect’s center frequency and number of phaser stages (or Poles).The Center control lets you change the frequency center (100 Hz to 10.0 kHz) for the phaser poles.Select the number of phaser poles (stages): 2, 4, 6, or 8. The number of poles changes the character of the sound. The greater the number of poles, the thicker and squishier the sound.