Hey Maurice, I'm not a mac user yet but I presume that settings are the same on iTunes for mac.
Make sure that "mono mode" is not being forced by the iTunes MP3 encoder. In the iTunes, edit menu, preferences, go to the "advanced tab", then go to the subtab called "importing". on the encoder setting, you choose "custom". On Windows, when you choose "custom" and you close the list, a new window is opened so you can adjust the encoder settings. On the item "channels", select "auto" so that the encoder makes propper channel adjustments according to the audio source. Done this, press the "ok" button in all the windows. Now the encoder should use automatic channel configuration for each audio you encode. If is there any aditional trick, please guys let me know too. Hope this helps. Best, Edu Camargo.
