Urgent help needed with midi controlling!

Hi, I have very little experience with max/msp. I have created a simple matrix which triggers 8 different samples to turn on/off (the samples are all stored on [buffer~] and are played using [groove~].

I need to be able to control the switches on the matrix using my M-Audio Oxygen (v.1), preferably with the piano keys. In addition to this I would like to be able to control the amplitude and panning of each using the dials on the midi controller. As I am so inexperienced I have spent some hours trying to work out how to do this with the tutorials and help menus but I am completely lost!

Any help would be greatly appreciated.

Thank you!