problems with cubase 7 elements: midi track editor

I have problems with the editor of a midi track.
When I move a note or click on it, it does not sound.
the track is not in mute.
if I play, if it sounds
if I press the keyboard keys on the left if it sounds.
But above the notes does not sound.
can you help me?
Thank you


Make sure „Acoustic feedback“ is activated, and the fader for it is up. (Editor toolbar)