Not sure if there's specific to a DAW' routing thing going on there, but in Sonar ..and for
most mixer speak' in general..
A send' is an 'aux send'.
A 'bus collects things and provides a point of common control, and in some cases further control as in pan, insert.. (your stereo 'master bus, or 'aux bus).
Saying 'aux send implies adding a split
off of the main track route (AKA a parallel path.
Has nothing to say about its original main path (which remains).
That track (and other's) main paths may also go to a bus' which if you called it a 'Sub Group (or 'sub bus) says 'a common control point for the
track's main paths –typically before going to the main bus/output.
The up shot is that while 'bus' is a specific thing, the term by it's self isn't complete in this context.
Well, that depends- On what you're asking..

(..and/or perhaps like the first question has to do with some DAW's that decided to mix the meanigs of 'tracks, 'aux' or 'bus' ?...
