One limitation of the ProTools free is that it will only do eight tracks at a time. Obviously, you can get round this with partial mixdowns, but perhaps the $40 for n-Track may be a better investment. Certainly it is a good product, with good user support (both here and on the n-track site), and Flavio, the guy who wrote n-Tracks, updates it pretty regularly (I thinks I've had 12 upgrades since I brought it about 10 months ago - you won't get that from anything, including the bigger players). He also takes feature requests, so you can get a bit of input into the functionality of the program.
- gaffa