This article is about how to get rid of clicking of a metronome to stop from bleeding out of monitor headphones and onto a recorded track, especially when recording acoustic work. The main tip is to use in ear headphones instead of over the ear headphones because they don’t project out as much sound.
A good read:
How I Kicked Click Bleed to the Curb
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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?