Sector 2048 has the eq stuff in it. I'm still playing, but it looks like the left channel starts at byte 229 and the right channel at byte 269, (each of the EQ bands using 4 bytes) and the left and right use up through bytes 268 and 308.

Makes sense since there are 10 bands, I haven't yet figured out the encoding or the significance of bytes 178 and 188 (which are 0 until the EQ is modified, and which probably represent some sort of bitmask of which bands are active (left and right respectively) or of bytes 5 and 6 (but it's going to be size or checksum)