So, I've got a line 6 DL4, which is powered by a 9v AC power supply. The rest of my pedalboard is powered by a voodoo labs DC multi power supply. Now, the DL4 will also run on 6v DC (supplied by 4 C batteries.) So, is there any mod or device I can put inbetween the voodoo lab and the DL4 to cut the 9v DC down to 6v DC? Thanks! D.G.