I am a new Virus owner. I have encountered a few challenges in getting it integrated into my setup, but I think I've figured out workable solutions. I'm posting this to the forum in case more experienced owners have developed more elegant methods of dealing with the same issues. This is a bit long-winded, but I've found its better to provide precise information when asking for help. I have searched the Access Forum and did find some threads discussing compatibility issues of Snow vs. TI. They did focus on a situation where the user was "upgrading" from a Snow to a Virus TI. My situation is similar, but not identical.
I work in two locations. At night, I work in my home studio with an iMac and a Polar. I use Logic as the DAW. All instruments other than the Polar are virtual. During the day, I work in a different location using a MacBook Pro and a Snow. The two Macs are set up so that they have identical software configurations (Logic and the various VI plugins) and all project files are saved to a Dropbox folder that is accessible from either location. When I was relying solely on virtual instruments, the transition from one location to the other was seamless. I could stop work on a project at home, and pick up exactly where I left off at the other location without having to change any settings in the software, and vice versa.
To give me the same ability with the Access units, I have landed on the following approach. First, I need to keep the number of Access-related tracks in a project to a maximum of 4, which is the limit of the number of Parts that can be output from the Snow. I could add more Access tracks but would need to bounce any tracks in excess of 4 to audio. I am used to shifting midi regions and modifying the length of projects right up to the last minute, so bouncing down a track to audio doesn't fit too well with my work process. I realize that I could chop up the audio tracks, effectively turning them into loops that I could arrange. I also realize that tracks need to be bounced in realtime. Not a problem but I haven't discovered how to bounce multiple tracks to separate audio files, so it can take quite a while to real time bounce tracks one after another for a project that is, say, 10 minutes long.
The Access Control plugins for the Virus TI and the Snow are different (i.e., there are two of them). So, when I open a project that was last worked on in my Polar setup, I need to switch the channel strip input setting for all Access tracks in Logic to the Snow plugin. Same process is required when I switch back from the Snow to the Polar. That's not a problem. Just takes a couple of seconds to change the instrument settings on a few tracks. The previous forum postings suggest that in making the change, I will lose automation data for the Access tracks. I'm not sure if that applies to Volume automation as well. I can see why it might apply to filters, effects, or other parameters where things would be mapped differently in the TI vs. the Snow. Haven't experimented yet to see.
Getting the patches to sync up when switching instruments was a bit more of a puzzle to me, but I think the following method will work. I do know that I can load the same patches in both the Polar and the Snow. I also know how to shift patches to slots in the RAM banks and (although I haven't tried it yet), how to burn a patch to one of the empty ROM slots. So, I am thinking that I need to load the patches that I'm using on the four tracks to the same four slot locations either in RAM or in unused ROM banks on both the Polar and the Snow. They won't load automatically when I switch the track input from one instrument to the other, but they will at least be in a consistent location in both instruments, which will make it easier to find, especially if they come from, or are based on presets from, different libraries. The Access control library search feature does not search across multiple libraries from what I can tell, which makes sense.
That's what I've figured out from reading tutorials, various forum postings, watching Access videos, and Youtube videos. Does anybody out there have a better approach for shifting back and forth between Virus TI and Snow on a continuous basis? And "no", buying another Virus TI is not a viable option!