Many users who have updated to iOS 16.4 must have a similar issue if the issues stated by you are due to the iOS.
Unless you state what the issue is many in this forum may not be able to respond positively to the issue you are facing.
iOS 16.4, there is no mention of any sound addition here...
This update introduces 21 new emoji and includes other enhancements, bug fixes, and security updates for your iPhone.
This update includes the following enhancements and bug fixes:
- 21 new emoji including animals, hand gestures, and objects are now available in emoji keyboard
- Notifications for web apps added to the Home Screen
- Voice Isolation for cellular calls prioritizes your voice and blocks out ambient noise around you
- Duplicates album in Photos expands support to detect duplicate photos and videos in an iCloud Shared Photo Library
- VoiceOver support for maps in the Weather app
- Accessibility setting to automatically dim video when flashes of light or strobe effects are detected
- Fixes an issue where Ask to Buy requests from children may fail to appear on the parent's device
- Addresses issues where Matter-compatible thermostats could become unresponsive when paired to Apple Home
- Crash Detection optimizations on iPhone 14 and iPhone 14 Pro models
Some features may not be available for all regions or on all Apple devices. For information on the security content of Apple software updates, please visit this website:
Apple security updates - Apple Support
With the limited information that you have provided, It is hard to even guess the problems faced by you.
You may get faster and better responses to your query by --> Writing an effective Apple Support Commun… - Apple ...
Please re-post with detail so that someone else can help.
