silvertones
how any daw loads traks is.. into small arrays of memory or buckets.
think of it as time slices being mixed before they are needed
useing look ahead techniques in software coding.
in summary whole traks are never loaded into memory...
otherwise in large trak count songs , users pc's would run out of memory.
(well except if one is useing a OS that supports large memory address spaces.
which isnt the norm. thgo this is rapidly changeing with vista and w7.)
this is to simulate a real time process.
ie its an illusion !

there are various buffer and other settings in rb and powertraks, ...
and if were me i would spend sometime with each and experimenting.
in ptw this is what i had to do to make an edirol work fluidly.
it was a setting.
frankly you just cant set settings at default and expect all to be kosher.
you still didnt tell me what audio drivers your useing in audition.
are they asio ?? mme ?? what are they ??
by the way do you have advanced audio/midi sync checked ??

retired puter engr....powertracks on amd......NICE !
"what is the black art of audio engineering ?"
my silly songs...motagator.com/bmanning
see my tips in the tips section.