[PeanutNore]

Ableton lets you import .mid files which can be easily created from western notation using MuseScore. I use Ableton as my DAW and if I want to write something in staff notation I just write it in MuseScore (because it's got a good interface for it anyway) and export it as a midi file which I import into Ableton. For the kind of music that I make, though, there's rarely a need to write anything down. I know the parts in my head, I hit record, I start playing.

[Kye]

There are M4L devices that allegedly let you use notation in Live, but I could never get them to work. You've probably looked into them already, but I mention it just in case.