a half price octa bass is not something to over look
get it for some things, and then when you find another get it for other things
as someone else said, tracking depends on many factors, !!!
the bass, the strings, the hands how you strike notes, pick ups and their height, a good cable going to the octaver which should be first in line from any of your pedals.
I use the EBS octa exstensively, it is essential to my grindy dirty and sometimes doomy sound, i use it down to G sometimes
sustain wise on my bass and set up it wobbles out after 10 - 15 seconds
the sound quality of the octave is what turns people on to this pedal
it sounds enormous, worth picking up for somethings even if it does not do all.
ALso I use it exclusively with a neck pick up, like where all the rich bass tones are on my P bass, it does not work as well on my friends jazz bass, radically worse actually