Lower octave

["Michael Peters" <mp@mpeters.de>]

I watched Theo Travis playing flute yesterday in Antwerp, and saw that he
used a Boss OC-2 octaver to occasionally add a lower octave to his flute. I
want something that reliably turns guitar notes (especially the lower 
notes)
into a bass - a pedal and/or a plugin. Recommendations?  (Andy, you will
probably recommend Chopitch - I need some help using it because more often
than not, the Chopitch sound gets cut off very quickly - not sure what to
do)

-Michael