try using one source intact and 2nd source cut up each song 2,3,4,5,6, if need be and match up in pieces to create the song.
a ball breaker but it will work. keep the 1st intact source bit louder than the edited 2nd source.
magix program will not help you with creating matrix. much better software out there for the job.
try audacity-free program-dl off the net.
i love and work with cubase sx3 program for ALL my audio editing and mastering , not free.
g