In SX Microcontrollers, SX/B Compiler and SX-Key Tool, Zoot wrote:

It seems like some of the event AddIns for Vixen will do exactly what you want, and then you could focus on (simplified?) hardware to go with a ready-to-go "algorithm":

Frequency Spectrum	 
Acts like a 31-band equalizer, allowing you to set up band-to-channel mappings and threshold levels. The results are events that are created in response to certain decibel levels of frequency bands.


Analog Frequency Spectrum	 
Like the above-mentioned Frequency Spectrum add-in, but this version has two sliders per band -- lower and upper limits. The intensity of the resulting channel events are based on how far the band's decibel level is between the limits. i.e. If it reaches halfway between the limits at a given point in time, the channel's intensity will be approximately 50%.

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