Also for the record. The way I am doing it is like this.
1. Installed Snow Leopard and the updates. Then run Time Machine to get your backup done.
2. Imported all my user settings from Leopard using migration assistant. Tested all apps and OS for stability. Did another Time Machine Backup.
3. Installed Logic 8 Studio. Only the applications, not the extended content. Tested it all. Worked perfeftly. Time Machine Backup. (I have not done ANY updates to Logic at this point period).
4. Installed Pianoteq 3. Tested. Worked perfectly in stand alone and in Logic 8. Time machine Backup.
5. Installed VSL VI and VE3. Tested. Stand alones do not work. AU plug-in versions work excellent inside Logic. Time machine backup.
Now I am in the middle of my time machine backup from step 5. After it finishes, I will do all the apple updates (Logic studio update 8.0.2 is really all it offers right now for me).
I will come back and edit the rest of the steps. So far it's working like a champ but been a bear getting here. That is why I am posting the exact steps that DO work so you don't waste your time doing it wrong.
*****PART TWO PICKING UP AFTER THE ABOVE STEPS
6. Right after I loaded all the OS X updates (Logic pro 8.0.2, Soundtrack Pro, Mainstage, Pro kit 1 and 2 and all the others that were on the list) I rebooted. Brought up Logic and instant lockup and crash with the same project that worked perfectly before updating. I force quit Logic and opened it again (but another project) and it worked perfectly. It then let me open the one that had crashed. Now it seems to open just fine.
7. I did a repair permissions on the drives and it found one wrong permissions setting. It had nothing to do with Logic etc but still thought it worth while to run a permissions repair. So far today it hasn't crashed once and it running incredibly smoothly. It is balancing the two cores on my MacBook Pro almost completely evenly.
I am going to test for a little while longer and if it locks up and freezes and crashes etc I am going to revert back to my Time Machine backup from Step 5. Then install each update 1 at a time until I find the problem child (I suspect it's logic update 8.0.2).
*****PART THREE - PICKING UP AFTER STEP 7 - Day 3
8. Well things are working very well so far. I have installed all the rest of my applications with the exception of Sibelius 5. It isn't compatible and they don't know if they will make an update to it so I ordered the version 6 upgrade today.
9. VE3 over the network is working better then it ever has for me.
I am having few issues though that may appear pretty severe, but I have a work around and it's not preventing me from getting things done.
a. My Expresscard RME Hammerfall isn't working (I use a dual systems adapter with the older PCMCIA card). Dual Systems was shocked 10.6 didn't build a driver for it since they built one in 10.5. So right now my main Audio interface is not working and I am having to work with the built in audio (which is fine for now). I am getting very good results and low latency. MY midi devices are now routed through my Axiom 25 instead of the Hammerfall so I haven't lost any real functionality that is show stopping at this point. It will be nice to have it back at some point though.
b. I have 3 external drives (2 USB and 1 Firewire) and it seems to always leave one out everytime. I simply unplug the one that doesn't connect and reconnect it and it works. But it's slightly annoying.
The speed and stability so far was worth the upgrade. I can live with the few strange oddities, it's still more stable and faster then it ever has been. This completes my process for now as I have nothing else to install until Sibelius 6 gets here in 2 weeks or so. I have no intentions of loading Garritan GPO etc anymore as I never use them and don't need to waste the space and resources anymore. Now I just sit back and wait for Apple or Dual Systems to write a driver for my adapter.
Time to do my final backup and get back to music making.
Maestro2be