Lynessence, I'm having an issue with my Zoom recorder. I can't listen to any of my #audio files on my phone or my Mac. I am told the .wav file is not a valid file. I have reformatted the SD card and a test recording seems to be working just fine. I also updated the firmware, so here's hoping whatever was wrong was fixed. Unfortunately, my audio recording of the plane taking off was lost, and the version I copied to my Mac is corrupted. My next flight is in May, so I will try another recording then.