I dont like Quicktime so i used nero soundtrax, inserted the files one at a time, in order, then saved the whole thing as a wav. Converted to mp3 with db poweramp.
Did exactly the same with the tunnel files, except I overlapped them to get a mix. you can zoom right in and see each beat, makes it not too difficult but some can still be tricky. practice makes it easier, i think i did a better job with vol 6 than vol 2(which was my first attempt). Should be the nuts by the time i get to vol 10........haha........ed