## REW Overview

When REW is started it looks like this:
The main window is blank until we either make a measurement or load some existing measurements. The SPL Meter, Signal Generator and Level Meters can be used without loading any measurements,
as can the RTA window, EQ window and the Room Simulator,

After making or loading some measurements the main window looks like this:
The measurements appear on the left, in overlapping panels. The currently selected measurement has a white background, the others are grey. On the right is the graph area for the current measurement.

All the toolbar buttons are now enabled. They are in 3 groups, firstly the buttons related to measurements:
These buttons allow a new measurement to be made, existing measurement files to be opened, all the current measurements to be saved in a single measurement (.mdat) file, all the current measurements to be removed, and an Info panel to be opened that shows additional information about the current measurement.

The next group has the various tools
The IR Windows button opens a window that allows the type and extent of the Impulse Response windows for the current measurement to be changed. Next to that are the SPL Meter, Signal Generator and Level Meters buttons. Then there is a button to open the Overlays graph window, which allows any or all of the loaded measurements to be plotted on the same graph. The last three buttons are for the RTA window, the EQ window (which is used to study the effects of EQ on the current measurement) and the Room Simulator.

The final toolbar button brings up the Preferences panel

In the graph area there is a button to capture the current graph as an image
a selector strip to pick the graph type
and buttons to turn scrollbars for the graph area on/off, toggle the frequency axis between log and linear, set the graph limits and show the graph controls menu.

Below the graph is a legend area that shows the trace values at the cursor position
If smoothing has been applied the octave fraction (1/48 in the image above) appears between the trace name and its value.

The first step in getting REW running is to set up the audio input and output and calibrate the soundcard.

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