A step-by-step USB MIDI connection check

Start with the piano port and cable

Find the port marked USB TO HOST or USB Computer on the piano. A USB TO DEVICE port is often intended for storage or a dedicated accessory and may not be the port used to connect a phone or tablet.

For USB-C devices, use a data-capable cable that fits both ports. A charge-only cable can supply power while carrying no MIDI device data. A Lightning device may need a compatible camera adapter.

• Confirm USB MIDI or USB TO HOST support in the piano manual.
• Use a data cable, rather than a charge-only cable.
• If an adapter or hub is involved, check whether it needs external power.

Test input inside the app

Connect the piano and device, turn on the piano, then select it on the Hello, Piano connection screen. Press one key and look for a response in the app input display.

If the input display moves, the MIDI path is working. MIDI carries key and performance information, so silence is a separate issue: check the piano volume, headphones and audio output.

Change one part of the path at a time

If no device name appears, begin with the port, cable and adapter power. If the name appears but keys do nothing, confirm the selected MIDI input and close another app that may already be using the device.

• No device: connect directly with another known data cable, then restart the piano.
• Not enough power: use a powered adapter or USB hub.
• Intermittent input: remove the hub and test with a shorter cable.
• Works on a computer only: check whether the model requires a computer-only driver and supports iPhone or iPad.

Use the manufacturer instructions for the final connection

Ports, adapters and supported connection methods can differ even within one manufacturer. Use the Hello, Piano model directory to identify the connection, then follow the manual for that exact model.

Test each part of the connection

Unlock the iPhone or iPad, connect the piano, then check the device list and key input in that order. If the accessory is not recognized, disconnect it, unlock the device and reconnect. Change one cable or adapter at a time so the result tells you something.

• Device appears and key presses register: the MIDI input path works.
• Device appears but keys do not register: check the selected input and the piano's MIDI settings.
• Keys register but there is no sound: check piano volume and audio output separately.

What to record before asking for help

Note the piano maker and exact model, iPhone or iPad model, ports and adapters used, and whether the device appears in the list. Include any power warning and the result of a second data cable. The manufacturer's instructions remain the authority for model-specific compatibility and power requirements.