My friend has this sound problem.
He has tried this fix.
In the mount and blade settings file, located under
(User/Documents/Mount&Blade Warband), there is a settings file
called "rgl_config.txt". In this file is a variable called
"use_winmm_audio". By changing this value from 1 to 0, the crackling
was gone.
But nothing works, any explanations?