- Different version of the lame mp3 encoder produce encodes differing slightly in quality (for better or worse)
- lame mp3 are always encoded the same way, whether it´s on AMD, Intel, any MS Windows, Apple OS or Linux -> lame mp3 is designed to be completely platform independent
- the only difference between the platforms is encoding speed (depending on CPU speed & efficiency of the OS)
- until recently I wasn´t aware of decoding differerences but they existed roughly ten years ago with certain software based decoders
Still, I don't own a X3 but could this make a difference!