Well, does anybody know what connections this http://www.superfi.co.uk/index.cfm/page ... uct_ID/731 or this http://www.superfi.co.uk/index.cfm/page ... ct_ID/3070 have on the back? I'm thinking of being cheap and getting one of these 2 instead of a digital multitrack and sending maybe SP into mixer and mixer into cassette recorder. which looks nicer, haven't even touched a cassette player/recorder for like 10 years.

I was never a fan of the side-load cassette decks with digital buttons, here's why:

Cassette recorders already have plenty of moving parts (things that can go wrong). These car style systems have even more- you need a 'traditional' cassette deck (where you can see the tape playing), one with the buttons actually connected to the operations- you won't be able to get nasty with the pause buttons. The model is trying to be too fancy, and belongs in a car dash, not a producer setup- the other one is digitally operated as well.
The cool thing about tape is it's analog- why pollute that ideal with digital buttons?

It looks like, judging from the instruction manuals, which are available from the Web pages you specified, that these both have RCA inputs and outputs. The pictures do look a little vague, though, for the K-505TX.

Erm please ignore this thread, it was posted when I was only half awake.