LolShield FFT Display

I'm writing code to display an fft analysis of audio on an arduino LolShield. It's currently a work in progress, and kind of works, except that the serial communication seems to be interfering with the leds.

Using

I'm using Processing, Minim, Arduino Code, and the LedSign library, as well as Jimmie Rogers' LolShield which I soldered together from a kit :D