Install iOS 12.2 for These Other Changes
The iOS 12.2 update comes with some smaller changes that might be of some use to you.
While most of the attention is on the improvements to Apple News, AirPlay and Siri, there are some smaller enhancements that might convince you to download it.
Apple's improved the quality of the audio messages sent in the Messages app in iOS 12.2. The company's switched to a new Opus codec at 24000 Hz.
With iOS 12.2 on board, .CAF files will sound a lot better.