Glad to see this thread resurrected, as the topic is of interest to many who use BIAB, but it never really shows up in tutorials due to the fact that we're talking about songs that are covered by copyright.

Charlie, I like your approach. I'm stealin' it! ;-)

I think of my results as "FRANKENsongs" because I collect a bunch of stuff and combine it all together to get what I want. This can include the original song, MIDI files, scavenged karaoke tracks, my own playing, my own MIDI editing, and now based on Charlie's input... individual tracks scavenged from the web.

The biggest obstacle when you try to merge tracks from different sources: there are slight differences in timing that make it impossible to use the tracks together without editing one of them.

RealBand has a feature on the right-click track menu called something like "TIME SHIFT AND PITCH CORRECT". You can use this to fit snippets to a new time. I haven't had good luck using it to fit a whole track unless both tracks were recorded to a metronome (often not the case). But I've had excellent luck when I break up the track and fit small pieces at a time. Assuming you already used RealTracks to create a cohesive rhythm section, moving signature licks to the right place is easy.

https://www.dropbox.com/sh/ey71h8ep047758h/AAC12jNM0Hz9Q8zsh5iDeqNHa?dl=0