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BackgroundMusic
Background Music, a macOS audio utility: automatically pause your music, set individual apps' volumes and record system audio.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Background Music seems to be free and allow you to change sound of individual apps, but haven't tried it out.
There you go. My simple replacement for the built in Sound Control -> https://github.com/tbrek/AudioDevice2
NOTE:
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Hence, a higher number means a more popular project.