Short codes are case-sensitive. Make sure you're typing the correct upper and lower-case letters.
Use the Retrieve Your Key
page to have another copy of your unlock sent to you. That email will contain your new short code.
There are a few things you can try:
- If you're using a MIDI adapter, try swapping the In and Out cables.
- If your keyboard is plugged into a blue USB (3.0) port, try using a different color (2.0) port instead.
- On Windows, you may have conflicting hardware (like certain Logitech webcams). This page describes the problem and the steps to fix it.
This is usually a missing driver. Double-check your keyboard manufacturer's website for an updated driver.
This is usually caused by a low-quality USB-MIDI adapter. This forum topic
has more information.
First, make sure it's a MIDI file. (MP3 isn't supported, unfortunately.) Then, follow the steps in the Adding Songs
Usually it's as easy as clicking the music note icon in the toolbar. See the Displaying Sheet Music
guide for more information.
Apple handles refunds for iPad purchases. This guide
shows several ways to contact Apple for an in-app purchase refund.
Visit your Google Play Account
page, locate the Synthesia purchase in the Order history list, click the three-dot icon at the right, and choose "Report a problem".