Hello, my name is***** to Justanswer! Give me just a few minutes to look up some specifics, I'm working on this now.
There are two ways to transfer the files. Since they are already mp3, all we have to do is move the file.
You can either:
Insert the SD card into your computer, and it will transfer just like any file.
If you recorded to the internal memory, you'll need to connect it to your computer. It will show up just like when you put a USB drive into your computer. It will show up as a mass storage device, and you can copy the file to your desktop.
You have an option in your device menu. You can change the recording media to SD card so you can save automatically to the card. Let me know if you have any questions.
You are very welcome, were you able to get the files saved?