I have some questions about using two combos with ricosound. I'm using a Laney kB(keyboard 50w) and an Eden em275. I bought a stereo to two mono cable. So, I've plugged the trs into the ricosound jack and one mono into each combo. When I have ONLY the bridge p/up selected, I'm getting sound from both amps which I believe to be one p/up(treble) and when I select bass p/up ONLY Iget bass through both amps. When I select both p/ups I get a combination through both amps. Is this the correct way? Also I am concerned about safety, ground lift. Should I buy a box with ground lift? I've seen a good one on eBay.http://www.ebay.co.uk/itm/AB-FOOTSWITCH-GROUND-LIFT-TOUGH-COMPACT-guitar-amp-switch-splitter-pedal-AB-2-/161644701306 Thanks in advance!