King Crimson, The Talking Drum, bass line

[SnappingTurtle]

I'm sure we have some musicians here, hopefully some of whom wouldn't mind indulging me in trying to discern the bass line to this interesting track, and hopefully have a better ear than mine.

http://www.youtube.com/watch?v=i89ZvBaOojM

It seems to be based in F. The main bass hook seems to be based around the three notes D#, G# and A. Apart from that there's that rising bit then up to a high note and back down for the main hook. The rising bit to me could be any four notes between E and A, I honestly can't tell (but I'm leaning toward F# to A in semitones). After I've tried it so many times they all sound virtually the same to me. Then I'm not sure maybe the high note is an A.

Help if you please!