I'll add my voice to the comments about RB. It works fine. Zero, you've said before that you're experienced with other DAW's. That means you know about having to set up your midi input/output drivers along with your audio in/out drivers. Same with RB. Go to Options>preferences/midi then do the same thing but hit "audio". It's all there buddy. If you can't figure it out, either call Support, use the Help file or post exactly what you're problem is.
RB will open Biab song files, midi files, combine them both, it will use multiple synths either DXi or VSTi, multiple effects both DX and VST's, generate Biab tracks, Real Tracks, Real Drums all kinds of stuff. It's a full blown audio/midi editor, has full mastering capabilities. You can use any of the high end mastering suites as a plug in like Ozone, T-Racks, Wave Gold, etc. I use Garritan, Sampletank, and a bunch of different effects plugs. The one thing it won't do is tempo lock so a delay effect that's supposed to match the tempo of the file won't work or using one of the Drum plugin programs that can create their own grooves won't work. Other than that, it does pretty much everything any other DAW will do. Maybe not as pretty or elegant but the functionality is all there. Keep in mind this is a freebie with most Biab packages or it can be bought for $49.95 instead of $2-3-5-or even $700 for Sonar Producer, Cubase, etc.
Again, it works fine you just don't have it set up properly.
Bob

Biab/RB latest build, Win 11 Pro, Ryzen 5 5600 G, 512 Gig SSD, 16 Gigs Ram, Steinberg UR22 MkII, Roland Sonic Cell, Kurzweil PC3, Hammond SK1, Korg PA3XPro, Garritan JABB, Hypercanvas, Sampletank 3, more.