Second generation Apollo interfaces (Apollo 8, Apollo 8p, and Apollo 16 mkII) feature a Monitor Output Gain bypass option that can be engaged to bypass all attenuation in the Monitor output path when using an external monitor controller.

With Apollo X Desktop interfaces, the Monitor Output Gain bypass option is no longer available as it is no longer needed. Apollo X Desktop interfaces do not include a Programmable Gain Amplifier (PGA) in the output path -- instead, Monitor output levels are controlled in the digital domain.

When using an external monitor controller with an Apollo X Desktop interface, adjust the Monitor Output knob fully clockwise to send full line level signal to the external monitor controller with zero attenuation.