SF is a multi-channelediting application. Multi-track applications allow overdubbing (old-school term for playing along with previously recorded material and adding to it). Vegas, Reaper, Pro Tools and Audacity, are a few DAWs. Audacity is free, Reaper is relativity low cost.
did you mean to say it not cause if so, i figured that part out, could send me a couple links of how i can multi track or what software/freeware is best to re cord on one and edit on the other. hope that made sense =] thank you for ur time