Each FX Rack has three FX Slots. The signal flow of every FX Rack type is in series, feeding the audio from the top slot through the middle slot and then through the bottom slot.
An example of this is illustrated in the picture below:
• In this example, the audio first goes through Flame Distortion FX Unit in the top slot.
• The distorted audio is sent into the EZ-Phaser unit in the middle slot.
• Finally, the distorted and phased audio is sent to the EZ-Verb unit in the bottom slot.