Hi, it sounds like what happens when an internal mixer loop back happens , possibly 2 channels sending in your sound-card, some plugin activated or when the input monitor is on while recording creating this flam effect. By process of elimination, can you please plug straight into your speakers, does this still happen ? What about headphones ? if not the issue is in your digital chain. hope that helps and if it doesn’t please write us at [email protected] and well investigate further to quickly resolve.