There is Shell Input application item in Volume Mixer after opening Touch Keyboard on PC (Hong-Kong version)

This icon is displayed in the volume mixer due to the feature that plays a feedback sound to notify the user of responses when there is input through the touch keyboard.
The icon does not disappear immediately because the app is not closed immediately due to the characteristics of the Windows Store.

Features are subject to change without prior notification.
Images are for reference only
Windows is either registered trademark or trademark of Microsoft Corporation in the United States and/or other countries. All other products and services mentioned may belong to their respective trademark owners.
Feature and experience may vary by device and region.
The above product description is only applicable to the Windows 10 on Samsung computers in year 2018.
The above product description was updated in September 2018 and for reference only.