This article’s key point is that not all of the online music scene is illegal. There are over 500 legal web based music services in 78 different countries. Sales of physical CDs and records has dropped 76% from 2000 to 2010, and is expected to decrease another 77%. In the US, digital record sales account for 52% of revenue, and 32% worldwide.
Read the full article here:
Evolution of the Online Music Industry | Visual.ly
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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?