It is rare to record a clear audible ghost's voice. I've used at least 6 microcassettes to record, with only 4 noticeable EVP's. There are some
people that use software to 'clean up' the recording, but I don't bother with it. If the recording isn't screaming at me, then I won't dig any
deeper. Perhaps someone here has experience with Cool Edit, or the like, and can offer their assistance.