Link to issue number:

N/A

Summary of the issue:

Following @seanbudd's suggestion in #16591 making classes and functions private.
The rationale is that we would like to refactor sound split code so that more code is going to be reused in application volume adjuster, but #16591 will have to be postponed to v2024.3. So we need to make sound split API private to avoid breaking API changes.

Description of user facing changes

N/A

Description of development approach

Prefixing with underscore.

Testing strategy:

Manual.

Known issues with pull request:

N/A

Code Review Checklist:

• Documentation:
  • Change log entry
  • User Documentation
  • Developer / Technical Documentation
  • Context sensitive help for GUI changes
• Testing:
  • Unit tests
  • System (end to end) tests
  • Manual testing
• UX of all users considered:
  • Speech
  • Braille
  • Low Vision
  • Different web browsers
  • Localization in other languages / culture than English
• API is compatible with existing add-ons.
• Security precautions taken.