Time stretching can be used to create a sound design effect in a Logic Pro or any other DAW of your choice. Starting with an untreated vocal sample, a stretching effect can be applied to the sample before inserting dynamic controls over the volume of the sample. Modulation features can also change the sound effect.
Some great tips. Check it here in full:
Using Time Stretching As An Effective Sound Design Tool
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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?