guitardood
Unless I missed something in rewire docs, doesn't rewire only account for sending midi to the rewired guest and receiving audio back?
This is exactly what you'd want for that purpose. For instance, I much preferred the GUI, workflow and mixing capabilities of Pro Tools than Reaper. But Pro Tools was choking on my VSTi's, for reasons that included it only being 32-bit. So I ReWired Reaper to Pro Tools. All of my MIDI tracking and mixing was done in Pro Tools. Reaper hosted the VSTi's. So Pro Tools sent the MIDI to Reaper, which fed it into the VSTi's, and the resulting audio was sent back to Pro Tools for mixing. Worked like a charm.
The only thing is that I think you have to match the bits, i.e. both versions have to be either 64-bit or 32-bit. It would be nice if that wasn't the case but I think it is. However, one of the limitations of 32-bit is that programs can only address a certain amount of memory. But if you have two 32-bit programs working to the same end, you have access to twice as much memory.