Banpass filter module

Removes non human frequencies from audio. Useful for downsizing files before sending to speech to textAPI. Eg Watson 100MB file size restriction.

ffmpeg -i aliceinwonderland_01_gerstenberg_64kb.mp3 -y -ar 8000 -af "highpass=f=200, lowpass=f=3000"  -ab 64 -ac 1 -acodec mp3 test1.mp3

Link to trello card: Banpass filter module

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Node module,