Which app are u using to record your voice...if u are using the native voice recorder app than the recordings can be found in the voice recorder folder...connect your evo to ur comp as disk drive and you will see d voice recorder folder which wl have all your recordings.
Hope this is wht u wanted to knw.
If you open you phone's memory card on your computer, there's a 'my documents' folder. Try opening that up and see if your recordings are in there. Worked for me. Although I had to convert them into mp3's from the format they were on the phone. Used a program called Switch Sound File converter. You can batch them if you have alot of recordings, but the version of the program that allows batching costs money. Hope this helps.