Ravenscroft 275 for IOS

[vid wes]

I recently purchased Ravenscroft 275 for my iPad. I connected it to my Yamaha P125 with a USB to host and a Lightening to USB. However I cannot figure out how to get the Ravenscroft sounds to play through the Yamaha. I'm guessing it is a setting in Ravenscroft but I cannot figure it out.
Thanks for any help.

 

[Biggles]

Can you give us more info about the Lightning to USB adaptor?