Add pink noise generator and room frequency analyzer

[mixxxbot]

Reported by: Pegasus-RPG
Date: 2015-12-29T00:14:08Z
Status: Confirmed
Importance: Wishlist
Launchpad Issue: lp1529729
Tags: eq

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Now that we have a Master EQ, let's add a pink noise generator toggle and a small frequency analyzer display next to the master EQ so DJs can "pink the room" (flatten the frequency response) easily right from within Mixxx, assuming they have a suitable microphone connected.

If it's helpful, Audacity has a built-in pink noise generator we may be able to use.

(http://www.nextind.com/blog/2011/07/07/tech-blog-room-pinking-with-eq-acoustics/)