KARupert

I'm new to DAWs and have installed Cakewalk along with an Akai MPK mini controller. I have followed setup instructions and can see my controller is sending input to Cakewalk as I'm getting green lights on the level indicator when I hit the pads and the keys on the controller. However, I am not hearing anything. I know the controller works because I set it up initially with MPC Beats and had sound from it. Any suggestions? BTW - my driver is a Realtek High Definition Audio