I took a look and the only other thing in there are the LEDs. It's a really simple layout. I may just have to live with the noise, it's only really bad if I have the mixer and the tone knobs turned way up, and I don't think I'll run that much reverb with this unit - it's way over the top for me. Interestingly enough, the hiss seems to lessen when I use both reverb and trem at the same time. I'm still hoping to figure it out, I'll keep you all posted when I find the answer.