NTG2 Comand APS (i.e Europe, Rest-of-world) can not support MP3, it does not have the decoder chipset (or, I guess, enough CPU to do it)
USA Comand APS (which is MCS-II) is completely different and does do MP3, and so does world-wide NTG1
I have never seen access to any further menu from engineering mode (apart from the NAV+5 menu) on NTG2
Sorry
Richard
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