FabFilter Pro-Q 3 online help

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Piano display

Using the Piano Display button at the bottom left of Pro-Q's interface, just above the bottom bar, you can toggle between the normal frequency scale and a piano keyboard display, via which band frequencies can be adjusted as well. The highlighted keys correspond to an 88-keys grand piano layout, ranging from A0 (27.5 Hz) to C8 (4186.01 Hz).

Piano Display

For every band in the display, there is a corresponding dot on the keyboard. You can interact with the dots in two ways:

  • Click the dot once to quantize the associated band's frequency to the exact musical note.
  • Click and drag the dot to change the frequency while keeping it quantized to musical notes.

While the piano display is active, parameter value displays that show a band's frequency will also show that frequency as a musical note (including cents offset). Note that at any time, also if the piano display is not showing, you can enter frequencies as musical notes. For example, you can double-click on the Frequency knob in the band selection controls and type "D#5 +13", or "A4".


  • To quantize a frequency without using the piano display, just double-click a curve dot in the display or the Frequency knob in the EQ controls, and enter a value like "A4" or "C#2".
  • Pro-Q 2 displays the C4 key as middle C, following the most used Roland standard. Note that some DAWs (e.g. Cubase) might use a different format, showing C3 as middle C (the Yamaha standard).
  • By default, the piano display key that matches the frequency at the current mouse position is highlighted, and a small label shows its note number. You can turn this feature on or off by clicking Show Frequency On Hover in the Help menu.

Next: Stereo options

See Also
Display and workflow

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