Hi lo.fi,
If you're using the 48 without NR, doesn't that make bounces impossible say after the first one (or is that why you're wanting more tracks?).
Al
I have no problem without NR, because the way my machine is aligned, the way I EQ, and with the tape I use (SM468 or AGFA PEM 468), tape noise is virtually a nonissue. The need for additional tracks is because of the music I make. It's more like sound collage, it's freeform and I often won't know how I want to arrange each piece until I've laid down several tracks. I mix sounds from many sources, including samples and cassettes and field recordings. Instrumentation-wise I currently have only one mono synth and I have to multitrack it to get the complicated kinds of sounds that I want. If I had more synths I could cut down on bouncing dramatically.
Currently my equipment roster consists of a 1/4" four track, two cassette decks, a 1/4" 2T deck and the 1/2" 8T, and I often use them all together to create one stereo bounce. For example, I use the 4T to create background ambience mixes or for echo, I might have two cassettes going with drone sounds or additional layers of ambience, and then all of the "foreground" sounds will be on the 8T. The problem is, since I often don't know how I want the piece to sound until all the tracks are in place, or how I want to structure it in terms of the overall arc of the piece, if I want to go back and change anything, I can't. If I want to change the levels or EQ on any single track in those mixes then I'm stuck. If I had a 16 or 24 track machine, I could do it all in fewer passes and not have to bounce as much, and keep more control over the finished piece.
Does that make sense? I've been doing this for a few years and I'm still working out the best technique to achieve it (and how to describe what I'm doing!) The stuff I work on usually ends up requiring multiple bounces. The finished piece might contain cumulatively around 36+ tracks!
Realistically what I probably should do is set up a hybrid system where I can load up the 8T and then dump it into a DAW and do this multiple times so I have more control over each constituent "sub mix". I'm working out two things concurrently though - How to make the sounds I want to hear, and how to execute it on the technological / hardware side.
That's a really long answer but I hope it answers your question