I have a mix system, so I'm stuck at 64. Because of the way I track my VI's from slave PC's (they come in as RTAS inputs via rewire), I end up being limited to tracking only 32 at a time. This is doable, but limiting since I would prefer to have discrete control of each instrument in the orchestra. For now I submix the instruments by section in Bidule. When I upgrade, I'll be using all the tracks that I can.