A post to our forums by Digitalo's Vic DeLeon reproduces a post he also made to the Devastation forums saying that they are hearing the displeasure folks are expressing about their displeasure at hearing the sounds in the Devastation demo:

The majority has spoken. Apparently this was a legitimate enough gripe and we will comply like the good developers we are trying to be. Most of the weapon sounds will be given an overhaul, with more bass, and pitch adjustments. I cannot promise anything but these changes should be in the full patch.