> You only need one occasion with a power failure or complete X lockup
Yes. Ext2 is generally dangerous.
For each power failure (or crash, or whatever), the chance of getting a
more corrupt harddrive increases. Also, it takes a lot of time (don't be
surprised if it takes more than 30 minutes!) to boot after an abrupt
reboot with ext2, because the disk is checked for errors.
And since both ext2 and ext3 are fast enough to provide probably
100 (or so) audio tracks anyway, very few people probably need that extra
few tracks or cpu cycles that ext2 theoretically might provide.