Queue ready sound/alert - I want it gone/replaced

[natassja72]

I see that there is a point to queue ready alert being so much louder than anything else, but I don't really need it, in fact, I hate it. I wish there was a way to adjust this particular sound volume but apparently all that can be done is to replace the sound. But here is the problem: I'm unable to locate it. I've used sound list from this addon, but was unable to find it. I've checked strings with all words that came to my mind that got something to do with it like queue/group/raid/ready/instance/lfr/random etc but to no avail.

BTW, /script PlaySoundFile("Sound/Interface/LFG_DungeonReady.ogg") is NOT the sound, contrary to what may seem by its name.
Does anyone know where to find it?