A simple electronic toy with big buttons that when pressed make a specific, short, sound?
We have a turn and learn cube but when buttons are pressed it sparks off a whole chain with different buttons lighting up and a long jingle playing. I have no clue what is going on so I don't think 6 month old DD can appreciate the cause and effect at all 
It needs to be buttons rather than whacking things with a hammer etc as she's not that coordinated yet.
Thanks!