Here’s what you can do, You can use apps to expand your piano enjoyment, Pairing – Roland FP-90X Portable Digital Piano (Black) User Manual
Page 12: The pairing process

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Connecting the Piano and a Mobile Device via
Bluetooth
Here’s What You Can Do
By using the
Bluetooth
function, you can wirelessly connect the piano with a mobile device such as your smartphone or tablet, allowing you to do the
following things.
Music played back by the mobile device can be heard through the piano’s speakers.
You can play back music data that’s saved on your iPhone or other mobile device, and wirelessly listen to it through the piano’s speakers.
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“Listening to Music Through the Piano’s Speakers”
You can use apps to expand your piano enjoyment.
You can install apps (such as Roland’s “Piano Every Day” or “Piano Designer”) on your mobile device, and use them in conjunction with the piano.
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“Using the Piano with an App”
Speakers
App [Piano Designer]
App [Piano Every Day]
Pairing
To wirelessly connect the piano with your mobile device, you must
first perform “pairing” to create a one-to-one connection between
the piano and your mobile device.
“Pairing” is the procedure of registering (mutually authenticating)
your mobile device with the piano.
Pair your device as described in the procedure for each function.
Pairing
The pairing process
Separate pairing is required for “playing music through the piano’s
speakers” and for “using the piano with an app.” Note that these
processes are different.
Playing music through
the piano’s speakers
Using the piano with
an app
Settings on the piano
Settings on the mobile
device
Settings on the App
App
Settings on the mobile
device
* If pairing is not successful, refer to If Pairing Does Not Succeed in “Using the Piano with an App” (p. 15).