I saw a video a while back that had a Casio salesman in a music shop in Australia demonstrating how to connect Casio keyboards to ipad 2 and play the GarageBand instruments. According to the guy any Casio keyboard should work.
I've got a Casio WK 3300 keyboard and tried to get it to work but it doesn't. The message box says it isn't recognised (not those exact words, but I can't remember exctly what they were). That was a couple of weeks ago. Today I tried it again with a powered USB hub but it still doesn't work. I coonected it this way:
I plugged the keyboard into the hub, the hub into the camera connection kit, the cam kit into the ipad. On the keyboard I turned the Local On/Off to Off. From the way the guy in the video talked it sounded like it should work with any Casio keyboard, but I wonder if mine is too old a model, I've had it since 2008.
It'd be great if I could get it to work!