I run a Focusrite 18i20 and i run Asio to keep latency down. I could run windows ancient drivers for BIAB.
I don't like having the volume controlled by windows, its not a professionsl thing to do, as if you have other things going on, maybe a webpage, the volume is also effected. The tech is not designed for musicians ASIO is.
Even when ASIO is "Always Asio" it is not.
TBH I have used BIAB for years just for playing practice tracks, running my virtual keys outside of the product. My confidence with the product is shot through be because everytime I try deeper integration, I run into problems with things not delivering. That is my opinion, others may disagree. Only this week I tried to reactivate the count in feature and it went flakey. But lets stick with this particular issue
On my system, even when I run Always Asio as it is called it is NOT always Asio. One time I spent hours trying to find out why the Styles playback was playing at a whisper only to find that gthe styles playback is subject to the windows volume control which happened to be turned down. Similarly, the stems export to wav files is effected by the windows volume control, if it is down on my system, even when using "Always" Asio, then the recorded volume, of an exported wav file is too low. If the windows sound is down completely, then the wav file is silent. It does not seem right to me to have the volume control of windows dictating the recorded levels of Save Special exported wav files, whilst in BIAB the volume is playing fine. But hey that is how it is programmed. More flakey programming is no suprise to me.
I have never used the BIAB VST, in my Cubase 14, until now, but today i did. i was not impressed by the results, the levels are wrong. Maybe, probably that is me. I searched for some way to monitor the levels of the output to the VST from BIAB, but I found nothing.
I suppose that i can must alter the recorded levels of the song export to Cubase by altering the Windows volume control. It is hardly pro, but it should work.
At the moment, I am trying to get out of the BIAB environment by exporting stems into Cubase, then I shall continue adding vocals and band members.

For me BIAB is absolutely fantastic, the best thing on my DAW, used every day, like a Maserati F1 sports car, tethered to a leaky raft, made by Robinson Crusoe in win 95, to travel the oceans.

Z

Win 11 64, Asus Rog Strix z390 mobo, 64 gig RAM, 8700k