If your having sound problems with Virtual DJ, 99% of the time it is drivers for your device. I have been using Virtual Dj for about 9 yrs now (When it was ATOMIXmp3). I started with a $10 sound card and now i use two sound cards. At times I was having that distorted crackling sound and i would pull out my hair trying to fix it, and at all times it was the drivers, a lot of times we think that we have all updated drivers, and lo and behold the devise website or windows update has updated drivers , so make sure your pc is up to date- a big plus for digital djs. Another helpful site is Virtual DJs message board.