Emax

So I took apart my EMAX keyboard that was giving me terrible digital noise on all the outputs when sounds were triggered. I pulled and cleaned all the DAC's and their sockets and then it magically worked! But a few days later when I went and sampled a drum loop I noticed the main outs were doing some weird doubling with a second sound in a lower pitch. I checked and the Dual voice setting is off in the preset that I created and I verified that it's only happening on the main outputs. Any idea WTF it is now?