I don't use the patcher except when I'm forced to. But after running the patcher that one time a month I delete the following files to eliminate the whirlygig noise... \everquest\sounds\eq_mount_01_idle_lp.wav \everquest\sounds\eq_mount_02_idle_lp.wav \everquest\sounds\eq_mount_03_idle_lp.wav \everquest\sounds\eq_mount_04_idle_lp.wav I actually have it scripted in a CMD file I run after every patch. Of course then you need to start the game using IS.....exe or your own custom -patchme shortcut. Or just turn off the sound!
Unfortunately for you, the Mech Guardian was the 12th anniversary and is grouped with the AV Legacy events on the /calendar in game. This means you will not see it until April 12th (ends May 11th). Interestingly, the patch seems to have broken the AV Modern part of the /calendar for now...I guess they are trying not to give anything away... ?