According to the following article the tone pie is the center of creating good “drum sounds”. The drum pie is essentially a guide to making drumming as good as it can be. It is the center of success for advanced drummers. The tone pie is made of eight identically sized parts. This is because each piece is equally important and necessary to get the final product just right.
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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?