[sdiy] For Your Christmas Color Organ/Envelope Follower

[MTG]

Did we talk about this guy? It's not terribly new, but I'd never heard 
of it.

https://mix-sig.com/index.php/msgeq7-seven-band-graphic-equalizer-display-filter

The interface is kind of funky, but here's the scoop:

/The seven band graphic equalizer IC is a CMOS chip that divides the 
audio spectrum into seven bands. 63Hz, 160Hz, 400Hz, 1kHz, 2.5kHz, 
6.25kHz and 16kHz. The seven frequencies are peak detected and 
multiplexed to the output to provide a DC representation of the 
amplitude of each band. No external components are needed to select the 
filter responses. Only an off chip resistor and capacitor are needed to 
select the on chip clock oscillator frequency. The filter center 
frequencies track this frequency./
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