Weird E app icon just showed up

So, all of a sudden there is an app icon with a large 'E' on it. Grey background with an off white letter. It doesn't open anything and I can't delete it. I can't find any other settings for it anywhere on the iPad.

The icon is an indicator for the Enhance Call Audio feature selected on the device. The Enhance Call Audio feature is designed to allow a user to adjust the sound quality over the earpiece of the device (e.g. Boost Bass or Boost Treble)
To improve sound quality for all phone calls, complete the following steps:
To improve sound quality for all phone calls, complete the following steps:
1. In the Phone application, display the menu and select Options.
2. Click General Options.
3. Change the Enhance Handset Call Audio or Enhance Headset Call Audio field.
4. Display the menu and select Save.
To improve sound quality during a phone call, complete the following steps:
1. During a phone call, display the menu and select Enhance Call Audio.
2. Select Boost Bass, Boost Treble or Normal.

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