I am using Nero 6.3.1.10. The available constant bitrates for AAC audio encoding are:
16(+4 for next bitrate)
20(+4)
24(+4)
28(+4)
32(+8)
40(+8)
48(+8)
56(+8)
64(+16)
80(+16)
96(+16)
112(+16)
128(+32)
160(+32)
192(+32)
224(+32)
256(+64)
320(+68)
388(+60) //???
448.

Since the increase in bitrates is 4, 8, 16, 32, shouldn't the above series finish like this:
...
224(+32)
256(+64)
320(+64)
384(+64)
448.

So, it should be 384 instead of 388?

Sorry to bother, but I couldn't resist clearing this up... :-)
Daniel