Power Tracks....
Hmmm...I stopped using Power Tracks about a year ago when I started attmepting digital audio with it. I couldn't normalize anything without getting nasty clipping noises (even if I normalized to -3 db or so). N-Track seems to handle audio much better, from what little I've used it. It's not as memory-efficient as PTPA, but has a nicer looking interface. I'm also not sure about how MIDI works with it, as I've only ever used it for arranging audio. I haven't tried any of the lastest PTPA versions (I have 5, I think). I'd consider using it again (especially the new one with Direct X capability!), if I knew how to get rid of that clipping.