Cleaning Up Older Recording, How To

That is just like asking someone how has never seen the house in question: "I have a new house and want to do some interior decoration, what should I do to it?" Can't be answered. It all depends on what's wrong with the track to begin with. You would tend to be looking at re-mastering this I suppose, if you don't have the original takes, so you might be looking at a linear phase equaliser. Maybe it needs some noise reduction too? Compression? Maybe if you post a sample up on the songs forum someone may be able to help. It's way too difficult to suggest anything without hearing the track first.

I also agree... the results will depend greatly on what you have to start with.

Having said that... if the recording is a clean mix, you can certainly spice it up a bit with Ozone. I even took some old cassette songs that I really liked and loaded them into my DAW and used Ozone to add a really punchy low end and bring back the sizzle to the highs..... the result was pretty good.