Aaaawww, c'mon!
First, you need an RCA-to-1/8"-stereo Y-cable adapter.
Plug the RCA's into the Line-Outs of the 424, and the 1/8" stereo plug into the Line-In on your standard PC soundcard.
Develop your 4-track composition and mix on the 424, as usual, to get the best sounding mix.
You'll need recording software that records from the soundcard's Line-In to WAV files in 16-bit/44.1kHz stereo format.
Once you've recorded your tape mixes to WAV files, then you need an additional piece of software to lay the WAV files out into songlists, and burn audio CDs of that.
Other software is required to convert from WAV files to MP3 files.
Sounds easy, huh? It is!
The Y-cable adaper is a common inexpensive Radio Shack type of item.
I can't name any specific software for recording stereo WAV files, but try software titles by MAGIX.
The only software I know of for free that converts WAV files to MP3 files is Audiograbber with a LAME plugin to get 128kbps resolution on your MP3's. Despite only being able to name one MP3 software title, (the one I use), there are many, so other suggestions may follow.
I heartily disagree with the above post & the opinion that cassette mutitracking is not a worthy format. First of all, pls don't burst a guy's bubble on his first post, & tell him he should just start from scratch recording on the 'puter. Second, there's a wide range of opinion on this board as to what's a worthy recording medium or not. Third, the question was specific, so pls try to provide an answer that fits the framework of the question.
One bit of bad news, is the 424mkIII has been discontinued by Tascam. Not only is it not available as new product in stores, but Tascam has removed it from it's website, and therefore removed the link to the downloadable manual. There's nothing that's too complex about the 424mkIII that it can't be learned by intuition, but if you're really needing the manual, you'll have to order it from Tascam Parts, at (323) 727-4840.
Good luck to the original poster. Mixing from the 424mkIII and recording onto the 'puter, for purpose of creating CDs of the mixes is fairly easy. Lots of people do it all the time, including myself.
Cheers.
Thanx.
