Sound samples can be replaced with wav files. The supported formats are 8-bit and 16-bit mono PCM with no compression. The Sfx resource_category directory is searched using the lump names of the original samples. For example, to replace j_doom's rocket launcher sound, the file dsrlaunc.wav would be placed in the Data/jDoom/Sfx/ directory.
Another way to specify an external_resource_file is to use the sound definition “Ext” key.
doomsday will automatically detect the format of a sample if it's loaded from a wad file, making it possible to compile a wad out of wav samples.