boominess of the podhd has got nothing to do with those farting sounds on the 4 notes. it seems like something else is the cause of it cause the farting sounds sound so different from the real tone.
@theunknown: side track, but what are those monitors in your video? they look rather different from my kurzweil. for mine, the diaphram isn't orange and the dust cap isn't shiny.
4 notes only that's why it has more to do with the room. i used to boom my room with an open A note. boom-ed another room with other notes. i believe this can be eq-ed away.