Guitar Sound

I saw your performance in Maplewood, MN. Fantastic guitar playing!
I had a question about how you achieve the lower frequency tones from your guitar and I am hoping you will share that.
I saw you were using a LR Baggs PreAmp. Is that all that was in the signal chain? It seemed like you have the lower frequency either pitchshifted down, or somehow boosted the harmonics to enhance the bass notes. I loved the way it sounded.