I'm not sure why they don't, to be honest. It's probably a DSP setup issue. Currently, you're *not* getting eq if you are in 4x5 EQ mode; you're only getting it on 2x10 mode.

You could try these (empeg_mixer.c):

2x10 band eq mode - write Y_OutSwi = 0xa49 (currently 0xa7c)
4x5 band eq mode - write Y_OutSwi = 0xa50 (currently 0xa85) - this *may* disable the onboard DAC though.

Hugo