finally an autotune app for android!
search the market for "micdroid"
really easy to use and it records them into a .wav format.
its is still in development and I found it over on xda developers (
link), keep checking for updates through that link
here's an example I created off my fiance's voicemail greeting. If you sing it will sound a lot better...
http://www.youtube.com/watch?v=OCR5RUzErVA