ipad keyboard clicks very quiet...

Hi. I have noticed that my iPad keyboard clicks seem very quiet particularly when compared to my iPhone 4. The keyboard sounds are on maximum and when I plug in the headset they are fine. All other sounds on the iPad seem fine. I am not sure but I am pretty sure the sounds on the keyboard used to be louder. Has anyone else noticed this? Don't have access to another iPad to test it so any comments would be extremely helpful.

Many thanks,

Rob