If you are hearing a loud or screeching sound through your headphones or speakers then there are a few reasons why this may be happening.
Turn your iPhone or iPad volume down! Try to keep it below 80%
Unplug your Mogees sensor from your iOS device.
Unplug your headphones or speaker cable from the Mogees connector.
Re-insert your headphones or speaker cable firmly into the Mogees connector.
Re-insert your Mogees firmly into your iOS device.
Restart the Mogees app you are using.
If you have a case on your iPhone or iPad, make sure that it is not preventing the Mogees connector from being inserted all the way.
If you are using a speaker, make sure that it is not positioned too close to the Mogees sensor.
The Mogees sensor is very sensitive and can pick up vibrations from a speaker if they are on the same surface.
Place your speaker on a different surface than to which your Mogees is attached. For example if you've placed your Mogees on a table, your speakers may feedback if they are also on the table.
Sometimes you may just need to turn your speakers down.