When using the main output on my DJ2Go touch, I get crackles and pops into my speaker. This happens whether or not I am using the Touch with DJay Pro on my iPad or Virtual DJ on my laptop. This does not happen if I use the headphone jack output on my device - only when I use the Touch's main output. I've swapped out cables and even sent the controller back to Numark. Their replacement does the same. Sometimes it happens as soon as I connect... other times, it starts 10 to 15 later. I've been thinking the Touch is prone to static buildup which eventually discharges to the main output. Any ideas?