Right. He's saying that the Central has the ability to make both high-bitrate and low-bitrate files at the same time. (It does this by default, in fact, and you have to specifically turn off the feature if you don't use portables.) And when you use the Download feature in Jemplode, it's only bothering to download the high-bitrate files.

Personally, I would only ever WANT the high bitrate files and don't see the point. Anything below 128 and stuff starts to sound downright horrible. But to each his own. I can understand that someone might want to do this.