Find the youtube link of the song you want to download. There is no real sign to tell what quality the upload is but considering the source you could guess. The standard site
My Free MP3 - Download Audio and Video from Youtube converts the audio to 192kbps, and the premium link
My Free MP3 - Download Audio and Video from Youtube converts it to 320kbps.
You could download them all in 320kbps but if it wasnt 320 or greater to begin with your just wasting space on your drive. Which ever you use please bookmark and share with your friends. Going to keep it ad free since its more for me and my friends, not trying to make $$ off it.