Linux puskom-ProLiant-DL385-Gen10 5.4.0-150-generic #167~18.04.1-Ubuntu SMP Wed May 24 00:51:42 UTC 2023 x86_64

//usr/share/glib-2.0/schemas/com.ubuntu.sound.gschema.xml

 <?xml version="1.0" encoding="UTF-8"?>
<schemalist gettext-domain="gsettings-ubuntu-touch-schemas">
    <schema path="/com/ubuntu/sound/" id="com.ubuntu.sound">
    <key type="b" name="allow-amplified-volume">
      <default>false</default>
      <summary>Whether the volume slider allows setting the volume above 100%</summary>
    </key>
    </schema>
</schemalist>