Doom 2 chaingunner uses shotgun firing sound and slightly slower rate of fire than the player. This DeHackEd patch gives the chaingunner the same sound and rate of fire as the player's chaingun, making the heavy weapon dude a bit more deadly.
The patch is as simple to apply as a BAT-file crispy-doom -deh cpos-bul.deh.
Warning: the demos recorded without the patch will be desynced.