Howdy
Well I have been doing that very thing for years. If you have a half decent sound card, (an old 16bit sound blaster will do)there is a program called Gold Wave that you can down load for free. This is a too good to be true program. But it is becoming my main stay for analog audio restoration.
FEATURES:
R & L independant track magnification, very useful for removing clicks.
Record and play controls.
Insert silence
Force to silence
Can load wave and other supported formats.
Send me your email address and I will send you a link to the site
grizzly@grizzlyscorner.com