Not so a newbies questions but still...noise adding(!)

[Anatolyz]

hi everyone!
im going to ask you kind of an unusual question ,saying the least
i want adding noise to my *.wav tracks i recorded,light hum or hiss...i'm not crazy ,i just need it to make the professional recording i made not so proffesional&more authentical...cause i have to send it as an audition cd
is it possible adding a constant noise (not too much) to the recordings?
thank you &sorry for the strange question...

AZ

 

[dementedchord]

stick a mic on the computer and record some noises it makes... mix to taste...