I wasn't asking whether (with Rewire ) Reaper ( ie DAW ) settings get saved in an SGU ( or MGU ) - ie in BIAB.
I was asking whether BIAB settings - the arrangement (SGU/MGU) get saved via ReWire in the ****DAW**** project file.
I was talking using the ReWireVST that I gave you the link to try so you would see how it works.
Biab is the Rewire master Reaper is the slave,
when I'm done I save the SGU, close Biab, Reaper will then ask me if I want to save the Reaper project so I select yes and save it in the same folder as the SGU.
If Biab has Rewire implemented you were using it as a slave to Reaper (Cubase) same deal it can't save the information inside an SGU inside the ****DAW**** project file. You will save the SGU in the ****DAW**** project folder.
This way if I slave Cubase to Biab with the ReWireVST, I can add all the extra tracks I need into Cubase, save the Cubase project. I can then open that Cubase project in Cubase standalone and master it.
With ReWire you have to load the saved SGU manually, for that inconvenience you will get 3-4 sec generate times, you will get the million and one features and functions, when you hit play on the DAW Biab will play back in sync to the DAW.
But for now if Biab is fixed to work with the ReWireVST the same way RealBand works then you will be able to do the same but only with Biab as the Rewire master.