Hey Hank,
that's just a LED VU meter using a bargraph IC.
3915 is log while the 3914 is linear.
I'm using the 3914 with a PIC in a BatteryMonitorSystem(BMS) that I
am working on. For monitoring 18 batteries in real time.
U don't really need a PIC for this simple VU meter.
I've seen several "light shows" circuits using LEDs and bargraph ICs.
IIRC, Craig Anderton had a "blinky light machine" using bargraphs.
that's all I got for ya..... afn Tone