AIX header:
0x00-0x02: "AIX"
0x03: "F","P", or "E"
0x04-0x07: offset of next AIX header, from 0x08
0x08... data

AIXF data: (starts file)
0x00

AIXP header:
0x00-0x03: "AIXP"
0x04-0x07: offset to start of next AIXP header (from 0x10)
0x08: channel number
0x09: 0x03 (maybe number of channels?)
0x0a-0x0b: size of data
0x0c-0x0f: frame number (-1 = first frame, -2 = last frame)
0x10... data

AIXE header:
0x00-0x03: "AIXE"
0x04-0x07: offset to end of file (or to more AIXPs)