@Lowell: A bit longer response to explain my reasoning
First let me repeat my wish for the option to have Cantabile racks available in other VSTs. And I do like Unify, so this is not to bash Unify…
UNIFY fulfills a part of the need to be able to have setups portable between DAWS, but in my view misses out on a number of key features available in Cantabile
UNIFY DOES NOT REPLACE CANTABILE
This is what we agree on. UNIFY is a nice new development that enables us to have preset/setups portable between DAWS. But the strong points of CANTABILE are - for me at least – the setlists that can be preloaded, using linked racks in various songs. Like this, if I have for example five songs all with my favorite Omnisphere strings patch of let say 2GB ram inside, it only loads that linked rack once - using 2Gb RAM instead of 10Gb RAM memory -, with no waiting times between the songs. UNIFY and DAWs cannot do this. Furthermore, UNIFY does not have setlists. Reaper for example does have setlists, but does not have the linked racks memory saving option, so your memory is pretty full if you load already a few songs. As far as I know, Unify cannot load two songs at the same time. So there are waiting times between loading two songs.
So we want to explore if it makes sense to use UNIFY within CANTABILE. At least this is what I am trying.
If we use SINGLE VSTs with a UNIFY patch, the 2-3% CPU load of each Unify instance will add up in songs that would contain then several UNIFY patches. Also, CANTABILE in a preload setlist mode would recognise all these single UNIFY patches as separate items and accumulate on memory and CPU usage.
If we use MUTIPLE VSTs within a single UNIFY song patch within a CANTABILE song, we indeed only add little CPU and we do have the advantage to be able to port the patch to a DAW for recording etc. BUT, we lose here the option to have linked racks. Also, again, CANTABILE setlist with songs build from single UNIFY song patches will be pre- loaded as if they are all unique items, so accumulating all the memory and CPU needed for the individual VST and patches.
So I came to a point where I am wondering where UNIFY does help me out with respect to CANTABILE, and as it stands I do not see the benefit of using UNIFY within CANTABILE, at least not if you have songs with demanding sample-based VSTs like Omnisphere etc. that you want to use in live situations.
What UNIFY does well in my judgement is using multiple core functionality.
Perhaps UNIFY still grows in functionality, but I do hope @Brad is able to develop the Cantabile Rack porting possibility. A bit like the Reason Rack option.