LED Bargraph chip (guitar LED bling-age) ..do with a PIC?

[HankMcSpank]

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

Thanks Tone,

I guess it's the log that would be most useful on a guitar. (the reason I want to use a PIC, is I'm putting on in my guitar anyway & it has lots of unused pins still! BLING!)

Just thinking here that to get the LEDs to fade rather than abrutly cut off, would problably need nothing more than a capacitor.

So...how on earth can log calculations on an analogue input be achieved on a PIC?