To expand on Load/Save scrap...
In an RB SEQ file you can select (example) bars 8-24 of multiple audio, MIDI and generated tracks, then 'export' (for lack of a better word) that section by using Save Scrap, and then 'Import' it into another project using Load Scrap, or the same project at a different spot, etc. It's a handy way of handling multiple tracks for a section of a song.

It's a unique way to grab a chunk of a song and save it for later or use in another project.
AND you can load any MIDI, Audio or seq chunk that way and it will adapt to the current tempo. (Time-stretch etc, if I recall correctly).

You can use the actual Import function for WAV or MIDI files and get pretty much the same result, but not a single file with multiple tracks of varying types.
That's where the Scrap feature shines.

I do not work here, but the benefits are still awesome
Make your sound your own!