Digital sound is not music but math. Sound is a vibration of waves, and these waves are mathematically represented by numbers. Computers store numbers in 1’s and 0’s so sound is stored in these numbers, called samples. Samples can be considered a snapshot of a sound. Digital music can and is usually compressed.
A worthy 5 minute read:
In The Studio: Digital Audio 101–The Basics
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I’m seeking info for sanctuary reverberation absorbsion material ( panels) and best placement.
There may be apps that do that. You can definitely find spectrum analyzers that will measure ultra low.
Is there an APP that can measure the ultra low frequency levels?