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Added demo sample

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Merge branch #Sonogram/Single-Audio-Demo' into 'Sonogram/Instructor-Support-Tool'

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Update sonogram_utility.py

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Added CSV support

Added textual details

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Update requirements.txt

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Update README.md

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Test download in column

Button column test

Testing columns and tabs

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Typo fix

Add download buttons

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Removed default categories

Added CSS color generator

Major Visual Change

Slight visual improvement, reducing graph count on screen

Fix off-by-one error

Add in RTTM TXT viewer functionality

Added TXT loading

Update README.md