No sound from midi keyboard

Hello,
I build the system with a Raspberry PI 2.
It is booting without problem but i can not hear any sound if i play with the keyboard.
I am using the onboard sound card.
I try with the aplay command to see if i can hear WAV sound from the speakers and the sound plays ok.
The midi keyboard i have is M-Audio midiman Radium 61

So did I.... boot without problems (seen with hdmi output), akai lpd8 and onboard audio output. With my win xp laptop I copied the folder "0 saw" on a blank usb key. No sound heard...