In RB I get the RealTrack & the RealChart, if the notation/midi could be grouped with the audio and be able to select a Beat/s and move the notation horizontally (so it's not stretching the pitch) it would also move the audio and I could create my own Melody/Riff from the RT.
I could do it manually buy copying the section of RT along with the RC to a new position on a new track but it is time consuming.

You can see in RiffStation how easy it is to create what you want:

Video
Riffstation RealTrack Riffs.mp4