I realize this is probably a rather amateurish question for a very professional forum, but was still hoping someone might be able to help. A friend of mine recently had his demo mastered on the cheap (against my advice). It actually sounds decent, but a couple songs are fraught with clicks and hiss (i'm guessing due to the original recording). Will removing the noise/clicks/hiss with Waves restoration or a similar plug-in affect the sound enough to require remastering? Or, if I'm careful, can the demo still be salvaged? Leaving all should'ves aside (e.g. should've spent the dough on a professional mastering engineer), does anyone have any thoughts on this? Any advice would be greatly appreciated.