Well, my experience with Audacity as a 'tracking' software is underwhelming and quite frustrating. I think it's a great tool for some final edits and so forth - but if you want to monitor tracks while recording new tracks, it really doesn't have a good latency management system in place and ends up being quite frustrating. With PowerTracks Pro Audio at only $49 (and other similarly priced products on the market) that can offer so much more than Audacity, those hours of frustration that you'll save with PTPA or N-Track or other similarly priced product will be more than worth the $49 investment.