ok...
finally i drew a diagram of my setup; i got asked a lot about using real amp and how to get that mixed with the Rocksmith sound, so here is how i do it
Guitar or Bass is connected to Input of the
Bigshot ABY (100€)
-- Output A - RS Cable to USB of PC
-- Output B goes to Input of a
Cheap ABY Switch (30€)
-- Output A - Input of Line 6 Spider IV Guitar Amp (110€) with Line6 FBV Express MKII Floorboard (100€) or a Bass Amp with LineOut (!) (100€) - as i am usi