I had the guitar and drum stems of Octavarium lying around, so I thought "Why not, let's splice them together and record my bass into it." So that's what I did. I mixed it in accordingly. There are some inconsistency issues like tone and how the lines are played, since I didn't take the time to listen to the original bass in detail. I don't even know if the link will play, however. It doesn't play on my computer but here you go, my monstrosity:
https://soundcloud.com/sourcegamer101/octavarium-bass-covercritisisms are welcome