# Sound Propagation Mode

This mode is based on Sound Propagation Mode Plugin by Boris Iwansky (https://github.com/biwa/soundpropagationmode).
Action category: Modes.
Default key: none.
This mode shows how sound propagates from the currently highlighted sector through the map.
User interaction:

- Click on double-sided linedefs to toggle "Block Sound" flag.

Following colors are used:

- dark green: the currently highlighted sector;
- light green: sounds can travel unhindered to these sectors;
- yellow: these sectors are behind a sound blocking line, but sound will still travel to this sector from the highlighted sector;
- gray: sounds from the highlighted sector will not travel to these sectors;
- red: these lines have the block sound flag set;