1) A-B routing(the first one in the routing list menu)

2)The presets that I mentioned are in DSP A

3)No,this doesn't happen with all presets,for instance,the group bank 66 Virtual Racks,works fine

4)

5) Yes,I tried to swap amps/cables,nothing changes,because If i do this,the same kind of      problem,move itself to right or to left

6) yes my bass is mono,my preamp is an M AUDIO audio card,so,It has 8 inputs and 4 outs(balanced/unbalanced).I run my bass into one input of the M AUDIO and then,the signal comes out from the out 1 and 2 of the M AUDIO to go directly into the inputs of the H8000