I just recorded 5 separate songs. 2 audio inputs 1 vocal 1 acoustic guitar . When I finished each song I saved the file and without closing, deleted the tracks and saved as a new file name and continued recording with previous settings. I thought this would be an easy way to do multiples without going through new file setups. Well, I went to add effects and mix. All songs except the last one went missing the two audio files. I tried to locate them to no avail. what did I do wrong? Just lost about 3 hours of live takes. I am using a Mac Book Pro with snow leopard.