I just noticed that the EQ button does not work. It sets it ON and OFF correctly, but rockbox does not verify that data. This seems rockbox specific. Only when going to Settings -> Sound Settings -> Equalizer - > Enable EQ -> then clicking back. This will update the EQ status.
In short words, the EQ button is useless at this moment.

Sorry about that, will see if there's anything to make it work. If not, then I will either remove the button in a future update or change it to something else that might be of good use.