If you have lot of audio tapes and want to convert them to digital format, here is a solution that I am trying now.
First I got “Microsoft Plus Digital Media Edition”:http://www.amazon.com/exec/obidos/ASIN/B000085AHH/jksobservat-20. This comes with an “analog recorder”:http://www.microsoft.com/windows/plus/dme/Music.asp#analog (The software costs $19.95 now, but if you “keep looking”:http://varnam.nationalinterest.in/archives/000205.html there may be a deal in which you get it for free)
I connected my walkman to the sound card of the desktop and the software did its part. The audio track was filtered for pops and hisses. The end product was clear digital audio, in WMA format. There is no way you can dump in any other format.
The process is very slow. You have to play the casette first, then it takes about that much time to write the digital file after applying all the filters. But it is worth it. Soon my house will be audio tape free.