Thanks for replying so swiftly. I have tried the same task on 2 computers, one with 3GB free and the other with 66GB free. The most important thing to me is that the audio is unbroken and unaltered. Unfortunately combining on the unit would take a long time (there are 47 tracks!). I have quite a few MD's recorded in this way which is why I am hoping to find a solution with Sonic Stage, but I am fine to try any other software as long as the audio is unbroken (which I thought Sonic Stage could do).