I bought the CDPS350 and was told I could connect an iPhone to it via Chordana Play for Piano, but when I open the app and try to do anything it just says “Connection Error: This function requires a connection to a compatible digital piano.” I ensured is the right app, and called Casio helpline but unfortunately they didn’t seem to know much about the product, though they did at least confirm I’m using the right wire (lightning to phone, USB-C to piano). They had me reinstall the app and unplug the piano to reset it, but then they just said “try a different phone and call us back, your phone might be too old”. I don’t have a different phone to test it but the App Store specifically says the app is compatible with my phone and my iOS is the most recent version. Thought I’d come here for help because the Casio help line person just seemed to want to get me off the phone. Thanks very much in advance for any insights.