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Krake developers need to measure SPL (Sound Pressure Level)
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To measure with commonly available tools such as smartphones- android and iphone , and wish to correlate one with another.
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mentioned in issue #124 & https://github.com/PubInv/krake/blob/155-doc-factory-test-and-assembly-instructions/PWA_REV2/Krake_Test_and_Assembly_Procedure.md
discussed in issue #192