I am using a cell phone dictation app to record. I then use software to convert into wav format. What I need to do now is connect both files. Since I am limited to 3 minutes and I need to give a 5 minute speech, I'm going to do part 1 and part 2. Ideally I can tack on the part 2 after I've converted into wav format. I am using windows vista. How would I go about doing this?