Background Color for BIN VU Meters
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By default, the background color of the BIN VU Meters is determined by taking the average color of an edge (one pixel deep).
Depending on the layout selected it would be a column or a row.
Point of note, if "Remove Background" is checked, then the background is the COLOR_MENU brush which foobar2000's theme sets to 0xf0f0f0 in light mode or 0x202020 in dark mode.

Ways to set a custom background color:

 - Bundle the BIN into a RAR with an INI file that sets "bgColour".
   Then, before the VU Meter skin is selected, ensure that the "Ignore Defaults" option in the context menu is not checked.
   For example, to set the background color to #131313 (hexadecimal RGB):
[DEFAULT]
bgColour=1250067

 - Use the background color edit box in the mixer configuration dialog.
   The edit box will appear unconditionally for bare BIN files.
   For RAR files, it will only appear when "Ignore Defaults" is checked.
   Then write the desired RGB value as a hexadecimal number in the box.

Using the "Default" button next to the edit box in the mixer dialog, aside from resetting the mixer slider configuration, will also revert the background color to the default based on the edge averaging method described above when the color edit box is shown.