Audio track volume control and SoundPlayer ducking #226

Job	Run time
Make SDist	1m 5s
Build for cp38-win_amd64	1m 2s
Build for cp39-win_amd64	57s
Build for cp310-win_amd64	1m 2s
Build for cp311-win_amd64	54s
Build for cp38-manylinux_x86_64	1m 53s
Build for cp39-manylinux_x86_64	2m 7s
Build for cp310-manylinux_x86_64	1m 54s
Build for cp311-manylinux_x86_64	2m 8s
Build for cp38-macosx_x86_64	4m 25s
Build for cp39-macosx_x86_64	5m 10s
Build for cp310-macosx_x86_64	4m 42s
Build for cp311-macosx_x86_64	3m 30s
Test Python ${{ matrix.python-version }} on ${{ matrix.os }}	0s
Publish to PYPI	0s
Finalize Coveralls	0s
	30m 49s

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