I was desperately trying to configure / add / remove / change / disable the default Audio Track FX in Vegas and was only moments from posting in this forum when I discovered at least one way of doing it. Maybe there's an easier way others could share with everyone. Otherwise, here's how I did it.
While in Vegas, hold down SHIFT on your keyboard while you navigate with your mouse into Options > Preferences...
Go to the Internal tab, this is a new "secret" tab that can only be accessed with the SHIFT trick.
Find Insert Effect 1 through Insert Effect 4, these are the default effects, by default there are three, and you can have up to four.
Replace all the fields with {00000000-0000-0000-0000-000000000000}, by default the Insert Effect 4 field is already like this.
Now, when you create new audio tracks they will load effect-less.
While in Vegas, hold down SHIFT on your keyboard while you navigate with your mouse into Options > Preferences...
Go to the Internal tab, this is a new "secret" tab that can only be accessed with the SHIFT trick.
Find Insert Effect 1 through Insert Effect 4, these are the default effects, by default there are three, and you can have up to four.
Replace all the fields with {00000000-0000-0000-0000-000000000000}, by default the Insert Effect 4 field is already like this.
Now, when you create new audio tracks they will load effect-less.