Hi Russ and welcome to the forum. You sure picked a good first question. This is like the smartest person in the world 200 years ago finding a beached nuclear submarine and trying to figure out what it is. I barely know where to begin.

First midi is not audio. Biab will generate both midi and Real Tracks. The RT's are audio files and midi is generated by a synthesizer. The primary purpose of that Roland is to provide a good synth for midi playback. You're asking about rendering songs to wav. That's all audio and you don't need anything other than your smart phone plugged into your PA. People here use smartphones, IPads, dedicated MP3 players and other gadgets that can play back MP3 files and can be plugged into a sound system. The differences people look at are jukebox functions, a bigger screen to see song lists, stuff like that.

The big problem folks run into especially noobys like yourself is the mix. What you've painstakingly mixed in your bedroom is totally and completely useless at the gig. You play your first song of the night at the gig and you go "I'm in big trouble.." the bass is too loud, you can't hear the drums at all, the guitar is way too thin, it sounds like a kazoo, in fact practically everything is wrong. Playing a stereo wave file in a venue away from your house can be a real mess until you've learned how to mix properly. The best way is to set up your PA in your garage turn it up to close to gigging volume and mix there. Forget about mixing in your house. IF you can get the mix right at home for 100 songs (no easy task) then just find a good MP3 player with song list and jukebox functions and that's it, you're good to go. You can slightly tweak the sound using the tone controls on your PA if the bass is a slightly too loud or something but you can't do a complete remix like that.

The Roland only has a tiny little screen and while it can be accessed to mix 5 or 6 or more channels it would be a total pain to try that live at a gig. This is why virtually everybody brings a laptop, opens up Roland's mixing application and then they can control the unit from their computer including the live mix. Of course as a technically challenged person as you say, you don't really want to do that, right? But consider the advantages of a laptop. First is the mixing but second is there are great free programs around for creating jukebox and song lists and you can display lyrics too.

I don't have an easy answer for you. This stuff is tricky and has a serious learning curve but we help folks here all the time with that. Tell us your thoughts on what I just wrote and we'll go from there.

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.