The plagal of fourth mode is else called Under-mixolydian mode. This mode differs from its base mode(fourth mode) on the master and ending notes. The reflecting sound of this mode is noted,
The plagal of fourth Mode uses the diatonic scale:
The master notes of plagal of fourth mode are in Ni, Vou, Di, and Ga, Di, Zo( when the base note is shifted three notes up). the ending notes are in Ni, or Ga- and seldom on the note Vou.