The manual (920) is pathetically lacking in detail. I was able to record all the commands using my laptop, Home, a mic and my 920 through operate my device. I now have a folder named customvoice and it contains 56 wav files of the directions I recorded. However, I can't find instructions on how to combine those files into the two files that represent each voice available on the 920. I tried support, but that was a waste of time.\n\nUpdate: Got it working. Now to rerecord the voice prompts so they flow and sound better. It turns out you simply enable the recorded voice.