If the player activates a SR switch (SR means "switch, repeatable") while being near the point (0,0) he will hear an "echo" of the switch being activated. The closer to the point the player is, the louder the echo. In rare cases the echo is louder than the actual switch sound.

This bug is somewhat similar to the (0,0) respawning bug.

The bug has been fixed in some source ports including ZDoom.

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