Graph Menu

Show/hide grid Ctrl+Shift+G
Toggle the grid on/off by using this menu entry or the associated shortcut keys.
Show/temporarily hide cursors Ctrl+Shift+H
Toggle the cursors on/off by using this menu entry or the associated shortcut keys. If the cursors have been hidden left clicking on the graph or actions that would move a cursor will restore the cursors.
Frequency Axis Log/Linear Ctrl+Shift+A
Toggle the frequency axis between logarithmic and linear display. The button on the toolbar provides the same function.
linear/logarithmic frequency axis button
Undo Zoom Ctrl+Z
Restore the graph axis settings that were in use when the middle or right mouse button was last pressed with the pointer in the graph area. The main application is to undo the last Variable Zoom or Zoom to Area action, but it can also be used to undo a pan or any other action that altered the axis settings since the right mouse button was last pressed in the graph area.
Fit graph to data Ctrl+Alt+F
Set the graph axes to show the full span of the data. The Fit to data button on the graph limits dialog has the same effect.
Find position on graph Ctrl+Alt+P
Shift the X axis of the graph to bring a position into view. Currently this is only active on the Impulse graph, where it places the peak of the IR 20% of the way across the graph as a quick way to locate the peak when zoomed in.
1/1 Octave Smoothing Ctrl+Shift+1
1/2 Octave Smoothing Ctrl+Shift+2
1/3 Octave Smoothing Ctrl+Shift+3
1/6 Octave Smoothing Ctrl+Shift+6
1/12 Octave Smoothing Ctrl+Shift+7
1/24 Octave Smoothing Ctrl+Shift+8
1/48 Octave Smoothing Ctrl+Shift+9
Variable Smoothing Ctrl+Shift+X
Psychoacoustic Smoothing Ctrl+Shift+Y
ERB Smoothing Ctrl+Shift+Z
Apply a smoothing filter to the current channel. Repeating the action removes the smoothing. Variable smoothing applies 1/48 octave below 100 Hz, 1/3 octave above 10 kHz and varies between 1/48 and 1/3 octave from 100 Hz to 10 kHz, reaching 1/6 octave at 1 kHz. Variable smoothing is recommended for responses that are to be equalised. Psychoacoustic smoothing uses 1/3 octave below 100Hz, 1/6 octave above 1 kHz and varies from 1/3 octave to 1/6 octave between 100 Hz and 1 kHz. It also applies more weighting to peaks by using a cubic mean (cube root of the average of the cubed values) to produce a plot that more closely corresponds to the perceived frequency response. ERB smoothing uses a variable smoothing bandwidth that corresponds to the ear's Equivalent Rectangular Bandwidth, which is (107.77f + 24.673) Hz, where f is in kHz. At low frequencies this gives heavy smoothing, about 1 octave at 50Hz, 1/2 octave at 100 Hz, 1/3 octave at 200 Hz then levelling out to approximately 1/6 octave above 1 kHz.

REW's smoothing uses multiple forward and backward passes of first order IIR filters to implement a Gaussian smoothing kernel of the chosen fractional octave bandwidth. For log spaced data those are IIR approximations to a Gaussian filter after Alvarez-Mazorra. For linear spaced data the time constant of the first order filter is varied according to the sample index to reflect the equivalent fractional octave bandwidth desired at the frequency of the sample.
Remove Smoothing for Current Measurement Ctrl+0
Set smoothing to None. Pressing the smoothing shortcut again will also remove smoothing - for example, pressing Ctrl+Shift+3 will smooth the data to 1/3 octave, pressing it again will remove the smoothing.
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