The following article is worth a read if you are starting out recording your own music. It will give you the ideas on how to secure the best all around sound for yourself. But you’ll need to develop an ear for the different effects that recording instruments tend to have. It suggests that you may want to start by using analog recordings as a reference point, which is a valuable consideration for you to keep in mind.
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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?