go here http://www.productionforums.com/emu/default.asp ther can explain about the 0404 to you.
I own a 1820, and its a piece of shit to install and get working but when it works it works great....
basically u get 4 channels a time in and out. will require custom cables to hook up ya mpc though, stero to mono 1/4 inch snake cables.
