Function to return a pointer to the current spectrum buffer. The buffer contains 512 floating
point values that represent each frequency band's amplitude for the current FMOD SoundSystem
streaming buffer. The range of frequencies covered by the spectrum is 1 to the nyquist frequency
or half of the output rate. So if the output rate is 44100, then frequencies provided are up
to 22050. (entry 511)
A pointer to the stream to have its spectrum graph returned.
Return Value
A pointer to a buffer containing 512 floats.
Remarks
Note that hardware sounds, MIDI, and WMA/ASF/Internet streaming files do not register on the
spectrum graph as they are not run through FMODs DSP system.