If computeFreqFromFFT() is called before enough data is accumulated, fft.forward(timeData) (line 468) fails

[benmurrell]

If the FFT method is used to determine frequency before enough data has been collected in timeData, the call to fft.forward() on line 468 will fail.

This is possible when isInitialized() returns true - this behavior should be documented, a cleaner/more descriptive failure mode should occur, and/or another function should be added to check whether the fft method can be used yet.

To reproduce this, you need to call a method like getFreq(2) immediately after the microphone becomes initialized. I modified the library to call a callback when the microphone becomes initialized - calling getFreq(2) from there triggers this behavior. Since your demo requires a user click before getFreq will be called, it is difficult reproduce in the demo as-is.