That's odd. My experience was the opposite. Although the Opus one was a bit muffled and some of the low end was missing so I had to strain a little to hear, the

That's odd. My experience was the opposite. Although the Opus one was a bit muffled and some of the low end was missing so I had to strain a little to hear, the MP3 was a cacophony of pops and whistles all the way through. It was annoying and hard to concentrate on. I'd take the Opus one every time. I will say the music part was interesting. I could mostly make out the song on the MP3. On Opus, I could barely tell there was music there. A lot of it was just missing.