David, I am not a pro! I am a scatter brained guitarist and I have a number of different workflows in BiaB, Realband, and Studio One Pro. I should note that I work almost exclusively in MIDI.

1- songs with vocals. The lyrics are first, then the chord progression. I put the chord progression in BiaB then I pick a style; many times this is the hardest but the most fun part. Most all of the time I will go directly from BiaB to Studio One Pro. On rare occasion I will go from BiaB to RealBand, especially if the time signature is something other than n/4 than into Studio One Pro.

2- songs with a melody. If I have a melody in mind my process is similar to #1. The main difference is that I most often have a style type in my mind already.

3- songs based on a sound. If I have a sound that I want to have for the melody I will pick a style, then add a chord progression, transfer the tracks to my DAW, then figure out a lead utilizing said sound.

4- songs based on a chord progression. Sometimes I will mess around on my guitar or keyboard and come up with a chord progression. That progression goes into BiaB. I then pick a style, transfer the tracks to my DAW, and work on a lead.

I should add that on #2-#4 I may go from BiaB to RB if the time signature is something other than n/4. RB Pros has said that RB can export songs in their native time signature; I haven't fully investigated that yet.

I should add that on occasion I will use a RealTrack as is but most of the time I will convert said track to MIDI.

I also label parts of the song in BiaB,i.e. V for verse, C for chorus, etc.

I think that covers everything. Feel free to comment. YMMV

Life is short so make sure you spend as much time as possible on the Internet arguing with strangers.

64 bit Win 10 Pro, the latest BiaB/RB, Roland Octa-Capture audio interface, a ton of software/hardware