I know to make a matrix I need to perfectly align two sources using a pair of common beats at the beginning and end of the recordings, like was mentioned in the earlier thread. But how do I stretch the length of one source to fit perfectly into the other source. I'm using SoundForge now and it seems to leave the length of the selection the same when I use the Time Stretch process. I can't figure out what it's changing. Is there a better program to work with? ???Thanks!