Minor changes to #990 (fixed audio glitches caused by previous audio concatenation method)

[thomasmny]

Description

All credit for this PR goes to @tonywiththetommy

However his PR has been stale for a while and accumulated some merge conflicts so I decided to redo the PR in hope that it can be merged soon. Also adds silence_duration to the config template which upstream didn't.

Issue Fixes

Superceeds #990

Checklist:

• [X] I am pushing changes to the develop branch
• [X] I am using the recommended development environment
• [x] I have performed a self-review of my own code
• [X] I have commented my code, particularly in hard-to-understand areas
• [X] I have formatted and linted my code using python-black and pylint
• [X] I have cleaned up unnecessary files
• [x] My changes generate no new warnings
• [X] My changes follow the existing code-style
• [x] My changes are relevant to the project

Any other information (e.g how to test the changes)

None

[JasonLovesDoggo]

Will review later

[JasonLovesDoggo]

works perfectly thank you @Trichtern this is great