If your keyboard has an AUX IN input, you should be able to connect your iPad/device to your keyboard using a 3.5mm audio cable. This results in the playback going through your keyboard's speakers instead of through your iPad/device.
If your keyboard has an AUX IN input, you should be able to connect your iPad/device to your keyboard using a 3.5mm audio cable. This results in the playback going through your keyboard's speakers instead of through your iPad/device.