Burp Noise

[GrayFox2510]

Ok, this is driving me kind of nuts.
Every now and then, I will hear this burping like noise while playing (and sometimes, another noise that sounds like an "eh-hmm" when you clear your throat).

I'm under the current theory that it's BugGrabber (or Swatter when I tried to switch BG off and use Swatter), but haven't been able to quite prove it as I can't reliably replicate the cause of the sound.

Thing is, this just started to appear recently. A few days ago I decided to give up FuBar and switched to ChocolateBar, and that's when it started. And I really can't imagine ChocolateBar being the cause...

Any help or indications as to why this sound happens would be GREATLY appreciated.

If it matters, here's a list of my running mods.

Auc-Stat-Histogram: disabled
Auc-Stat-iLevel: disabled
Auc-Stat-Purchased: disabled
Auc-Stat-Simple: disabled
Auc-Stat-StdDev: disabled
XPerl_RaidFrames: disabled
XPerl_RaidPets: disabled
XPerl_Tutorial: disabled
XPerl_PlayerBuffs: disabled
XPerl_RaidAdmin: disabled
XPerl_RaidHelper: disabled
XPerl_Options: enabled
XPerl_TeamSpeak: disabled
LibBabble-Class-3.0: enabled
acb_Auras: disabled
AtlasLootFu: enabled
Auc-Filter-Basic: disabled
Auc-ScanData: enabled
Auditor2: enabled
Enchantrix: disabled
Enchantrix-Barker: disabled
FuBar_MoneyFu: enabled
Mapster: enabled
DataStore: enabled
DataStore_Auctions: enabled
DataStore_Achievements: enabled
DataStore_Characters: enabled
DataStore_Containers: enabled
DataStore_Crafts: enabled
Informant: enabled
KHunterTimers: disabled
Acherus: disabled
AcherusLoader: disabled
AckisRecipeList: enabled
Altoholic: enabled
Altoholic_Achievements: enabled
AtlasLoot: enabled
AtlasLoot_BurningCrusade: enabled
AtlasLoot_Crafting: enabled
AtlasLoot_WorldEvents: enabled
AtlasLoot_OriginalWoW: enabled
AtlasLoot_WrathoftheLichKing: enabled
Auc-Advanced: enabled
Auc-Util-FixAH: enabled
AutoBar: enabled
BeanCounter: enabled
Broker_RangedSpeed: enabled
Carbonite: enabled
CarboniteItems: enabled
CarboniteNodes: enabled
CarboniteTransfer: enabled
DataStore_Currencies: enabled
DataStore_Inventory: enabled
DataStore_Mails: enabled
DataStore_Pets: enabled
DataStore_Quests: enabled
DataStore_Reputations: enabled
DataStore_Skills: enabled
DataStore_Stats: enabled
DataStore_Talents: enabled
DataStore_Spells: enabled
Factionizer: enabled
FishingBuddy: enabled
GatherMate: enabled
GhostRecon: enabled
GatherMate_Data: enabled
Mendeleev: enabled
Mounted: disabled
OPie: enabled
Overachiever: enabled
Overachiever_Tabs: enabled
Overachiever_Trade: enabled
ProfessionsBook: enabled
Routes: enabled
tekKompare: enabled
+Wowhead_Looter: enabled
zBrokerDurability: enabled
UrbinRange: enabled
Ace2: disabled
Ace3: disabled
ACP: enabled
ChocolateBar_Options: enabled
MobInfo2: disabled
!BugGrabber: enabled
!Swatter: disabled