All my presets have this sort of heart beat (lub dub) sound continuing on and on when I finish playing notes. Have reproduced this on multiple factory presets, and presets that Ive bought from vendors. Tried turning effects on and off but it does not seem to work. It's like this trailing lub dub sound after you play something and then mute with your hand. I was playing with my DT770 headphones. Will try to reproduce with my IEMs and iLoud Micro Monitors when I get the chance.