AudioListener / draw() synchronization

[uPaymeiFixit]

I'm not sure yet, but I think the draw() function and AudioListeners may be out of sync.

Consider the scenario:

"update" is called
    BeatDetect was false
AudioListener calls BeatDetect
    BeatDetect returns true
AudioListener calls BeatDetect
    BeatDetect returns false
"update" is called
    BeatDetect was false

The problem is that update never saw that BeatDetect was
true at some point, so it never lights up even though it was.

Research / solutions may include
~/Documents/Processing/libraries/Minim-2.2.0/examples/Advanced/AddAndRemoveAudioListener