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

I say, Yes.

SX/B 1.51 has a new command called ANALOGIN, so, in a nut-shell, with that much and some band-pass filters, it could be done.

[A color organ just turns a light on when a sound of sufficient amplitude within an established bandwidth excedes a given threshold.  It's not a VU-meter.]

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