HHHmmmmmm............
"well our band is thinking about recording an album withabout 9 tracks"
Do you mean to say that you have 9 songs you want to assemble into an album???...or that each song has 9 parts?????
If its 9 PARTS and you need to record it all live then you will need an addition mixer to sub-mix the 9 parts into 4....because the 4track can only record 4 TRACKS at a time.
"and we think that one tape (both sides) can all be recorded on the
Tascam 424 MkIII."
The 424 uses the entire width of the tape to record its 4 tracks.
A standard recorded album on cassette has 4 tracks of information........Side A Left and Right, going in one direction....and Side B Left and Right going in the OPOSITE direction.
A standrd cassette player plays only one half, or 2 tracks at a time and when you flip the tape over it plays the other two tracks going in the other direction so that it doesnt sound backwards.
Sooooo.....this means that if you record on all 4 TRACKS of a cassette on the 424 and play it back on a regular stereo you will only hear TRACKS 1 and 2.
If you flip the tape over in the stereo, you will hear TRACKS 3 and 4 but the will be playing BACKWARDS.
Conversely if you put a standard recorded album into the 424 and pull up all four faders you will hear BOTH Side A (from channels 1 and 2) and Side B (in 3 and 4 playing BACKWARDS) at the same time.
This is a good way to freak out your parents.....especially if you do this late at night and have your room all dark except for some black candles and have a dead chicken on a little alter with its head freshly severed while you chant along with the middle two tracks of the album and.....well anyways.....I digress.
So you can either use a mixer and sub-mix all of the parts onto 4 tracks live.
Or you can overdub bounce the tracks so they stack up to 9 or 10 tracks.
The manual has a pretty good step by step for getting up to 10 (i think) tracks onto tape by bouncing and overdubbing.
Either way..........you THEN need to mix down the 4 track recording to some sort of two track format ....whether it be to your cassette stereo, a computer, or a stand alone CD burner.
You can even mix down to a VCR.
Hope this helps and sorry if I oversimplified.
-mike