I had the same problem,I jist got the pod go and I used it with my Boss Katana mk2 with power amp in fuction and I thought I plugg the pod go in the power amp in and play,but because I was using cab in the Pod go the sound was so bad that I was so close to send it back..but when I found out that is not good to use cab when u have a amp ,the sound is very good now..I think and FrFR speaker or cab will give u the best sound from Pod Go.
The only problem I have now and I see other peopel have aswell is when I make a sound and I hear it trhu Boss katana it ok but when I use headphones is fizzy :( and bad..but if I use the factory presets with headphones is ok..I don't understand what I do wrong