A 4 track cassette recorder.............. NO!
I own and have used the Tascam 4 track cassette recorders and I confess that I love the critter, BTW I've owned the little 1 track at a time as well as the top of the line one and although I have really good comfortable feelings about it, even I must confess that it is a far inferior product to
the Tascam DP 01 FX. (I can't believe that I'm saying this because I really love and learned a lot on those formats). No matter how good your room and recording is, you are going to have to deal with a certain amount of noise that will have to be dealt with in "Sound Soap". (and often it won't get rid of all of it without sacrificing sound quality).
You need to convert everything to a digital format to mix on your computer editing programs anyway, so why not start that way?
Once you've worked with 1/4" tape and then go to a digital format, like even the simple but effective DP 01, you will be astonished at the clarity and the ceiling that you have to the sound. I am a convert. Yes the old high speed 1" tape is wonderful and has a great character and color, but 1/4" cassette tape can't match that and the old high speed pro tape recorders are prohibitively expensive to own and maintain for a small Home Recording operation.
Do yourself a favor and get something like the DP o1 FX. It's not prohibitively expensive and it's very user-friendly (unlike the big Rolands or
the Yamaha AW 16 G which I owned. Although they are good units, understanding them and using them effectively almost requires a college level course and the manuals are a bitch).
Make music without all the heartache and learn on this unit. As you learn more, then you can upgrade it you wish, but you'll never be dissappointed with the quality from the DP 01 series.