I want the sound of the app to come through my keyboard's speakers instead of my device's speakers. How can I do this?

You can route the audio of your device through your keyboard's speakers if your keyboard is equipped with an auxiliary input (AUX IN). Refer to your keyboard's user manual for more information about what is needed to connect. 

If your keyboard lacks an AUX IN, then you will not be able to route the sound of your device through your keyboard's speakers.