Update jack_meter.c#4

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ltmakela wants to merge 4 commits intonjh:mainfrom

ltmakela:patch-1

Commits on Feb 11, 2016

Update jack_meter.c
ltmakela
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Commits on Feb 12, 2016

Fix for sleep time
ltmakela
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Commits on Mar 28, 2016

Usage help line, repaired -p ports
ltmakela
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Commits on May 13, 2016

Fixed warning
ltmakela
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