With this you can control a Behringer DSP 8024 via Web Midi. It allows you to set the gain on each frequency band left and right.
This does not take any special setup into account. You should only have one MIDI interface on you system for this, the DSP 8024 needs to be on channel 1 (of course you have to switch on MIDI, the controls need to have no offset (CNTL 0 in the setup interface). This can only send the control values to the DSP 8024, it does not read the current setup. But hey, you can control the equalizer from a web page.
This only works in Chrome or at least at the moment it does not work in my Firefox!