use a general midi device to control the mixing console

i’ve just bought C8 pro, and it’s amazing! but i’am still trying to work it out as i would.
I’ ve red on the manual that you can set up 8 quick controls for each channel.
My question is, if i have a general pourpose midi device and i want to control each volume fader simultaneously, how can i do?
I think that in C7 was easier than in C8. Any suggests?