The new sound effects have been created entirely from scratch by Per Kristian Risvik, the original Doom sounds having only been sampled at a measly 11 kHz Kristian took it upon himself to remake them from scratch in 32 kHz and did a marvellous job in doing so, sounding identical to the original sound effects in many cases but in a higher quality! Having based my game around providing an up-to-date Doom-esque/Wolfenstein 3D experience it just made complete sense to also include Kristians sounds! Check out Kristians website for more information about how he remade these remarkable sound effects from scratch, audio reverse engineering at it's finest!