Does software exist that will take the bass line that you recorded and create the sheet music for it?
The only way I could think of doing this is with Ableton. It has a note recognition feature that turns an audio track into a midi track - of course, this works best with instruments that have a lot of attack, like a piano or clean guitar. You could then take this midi file and import it into a notation software of your choice, say MuseScore. The main problem I see with this is that the note recognition may produce a lot of extraneous garbage midi commands, which you then have to correct by hand. Your notation software may also have some issues with the midi track, like rests and note durations that just look hideous. It may be a lot easier to just notate the bass line by hand.
Thank you for that link. After posting, I found a program called IntelliScore (MP3 to MIDI converter free download - Convert audio to MIDI). It does what was mentioned in the other thread; it turns your music to midi, which can then be scored. However, pretty much all of the reviews I can find on it rate it really low, saying that it doesn't really work that well (if at all).