Alright, got two strips of eighteen WS2811 LEDs installed, original sketch by @Andrew_Tuline modified, and working perfectly. Thank you to everyone who helped with modifying the code!
That came out great Kyle! How were you able to get nice clean sharp bends of the LED strips around the corners?
Thank you! I cut them where the pads are exposed and soldered some 20 gauge solid copper wire (bent to the correct angles) on the pads. Took a bit of trial and error but it truned out pretty nice! 
Did you fasten the strips to the PC, and then fasten the wires? I’m asking because this is an area where I’ve had challenges in the past (mainly on 60 and 144/meter LED strips, because the pads are so small).
Yeah very nice. Good job !!
Thank you! First I took off the white grille thing in the front and found that the strips i have are about .020" narrower than the inside of the grille, perfect! Then what I did was put the strips in the grille, hold the angle of the separate strips down with masking tape, then take them out and solder the angle correctly. It took a while because some of the corners were too close to each other to use the pads at all, so on a few of them I had to solder wire directly to the LED. After I had everything soldered correctly, I cut strips of diffuser paper and put it in front of the LEDs because it made it look SO MUCH better. Yeah, I can imagine the strips that are more dense with LEDs would be a lot more difficult, these are 30LED/Meter. I’d like to get some 144LED/M and swap them out at some point but these are fine for now.
That looks pretty awesome! Great job on the corners as well.
In my experience you just have to sacrifice an LED on each end of the 144/m strips. There’s just not enough room to cut those pads in half and have solderable copper on both sides of the cut.
The fire example will look awesome on that setup.
Oh they do! I could post a video tonight.
@Robert_Atkins That’s a great suggestion regarding sacrificial LEDs in a 144/m strip. That sure sounds like it would make things easier!
@Kyle_Halvorson I look forward to seeing a video of your PC in flames (so to speak). 
I’m working on adding five more separate strips tonight as well, but they’ll all be on the inside, and I definitely won’t finish tonight. 
if I can get it to work correctly (the doubling of the program on one arduino) I’ll post a video of the current LEDs with the fire example tonight.
Hi Kyle! I’m just starting on a fastLed project and want to do something similar to the front of my bass amp cabinet. Have you posted the code anywhere? It looks great!
I have not, but I could post it to GitHub tonight if you like.
That would be great! I’m presently working on the circuit that translates the ± 40 mv guitar signal to 0 - 5v to feed to the arduino.
Oh nice! I’m off work at 4 and I have some errands to do after, so I’ll try to get it online by 5.