FabFilter Pro-MB online help

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Input and output options

At the righthand side of the interface, FabFilter Pro-MB offers a high-resolution output level meter. At the top of the meter, the maximum output level is displayed together with a clipping indicator. Simply click the level reading to reset it. Note that the level meter uses the gray display scale, ranging from -100 to 0 dB.

At the right bottom of the interface, you'll find the bypass, mix, input level and output level controls, all accessed via a single output button. As soon as you hover the mouse above the output button, a panel will pop up, giving you access to the following settings:

Output options

  • The Input Level/Pan knob at the left adjusts the level and L/R panning of the input signal before any processing is applied. You can use this as an alternative to changing the threshold of all bands.
  • The Output Level/Pan knob at the right adjusts the level and L/R panning of the final output signal. This lets you compensate globally for any gain added or removed by dynamics processing.
  • The Global Bypass toggle button to the left of the Mix button bypasses the entire plugin. While most hosts already provide the ability to bypass plug-ins, our internal global bypass feature is guaranteed to correctly compensate the latency of the plug-in and it also applies soft bypassing to avoid clicks. While the plug-in is bypassed, the display dims and a red light glows in the bypass button itself. The top of the output button in the bottom bar is also highlighted in red.
  • The Mix slider enables you to mix between the dry and processed signals, scaling the overall dynamic and static gain changes for all bands. Because the Mix slider ranges from 0% to 200%, you can also choose to increase overall gain processing instead of fading it out!


  • You can directly adjust the mix, input gain or output gain by clicking and dragging the button text vertically. You can also double-click the button text to directly enter a value using the keyboard.
  • If desired, you can make the output options panel 'sticky' by clicking the output button once. Click it again to hide the panel.
  • By holding down the Alt key while dragging, input and output level can be adjusted simultaneously in the opposite direction.
  • You can reset the level meter peak read-outs by clicking them.

Next: MIDI Learn

See Also

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