if you thinking of using for guitar, unfortunately, it wont work. Theres only rca input/output, not 1/4' phone jack. And even if you use those rca to 1/4' jack, it will work, but there be big loss of volume and hi freq...
heh, they got guitar tech and such to zhng for them. Iam not sure how they do it or convert anything.
But theres indeed a way to combine the KP with guitar which i did. Need to build a circuit thou. I got the schematic if you wanna. But you gotta go thru the circuit or find someone who can read those and try building it, all the parts can be gotten locally and circuit will work, although there might be mistakes in there. Heh, it can be sorta unstable circuit thou, at times...