How to disable completely audible beeps?

You should put "set visualbell" to your ~/.vimrc file, see ":help visualbell".

This doesn't seem to work. I disabled all beeps in vim and they are still there in AppCode...

Check that IdeaVim has found and parsed your .vimrc. Run ":set" in the normal mode, you should see "visualbell" there if it's set. Try ":set visualbell" in the normal mode. It should work for the current session.

If I disable the bell from within AppCode it works, but just for the session. If I close AppCode and reopen it it doesn't work. And I am sure that IdeaVim doesn't load my .vimrc file...

What's your OS and where is your .vimrc located on the file system?

I am using OS X Mountain Lion and my .vimrc is in my home directory (~)

Please paste an excerpt from your .vimrc where you define 'visualbell'.

autocmd VimEnter * set visualbell t_vb=

But again, I am pretty sure that IdeaVim doesn't parse my .vimrc

Why do you think so? Try setting hlsearch or ignorecase in .vimrc, for example. You should see them in the output of ":set".

Also note that IdeaVim is able to process only the top-level 'set' declarations in .vimrc.

I tried to add `set visualbell t_vb=` to the vimrc (in addition to the autocmd) but that didn't do the trick..

Also non of the stuff that I have in my vimrc is picked up by IdeaVim.

PS: I use janus

Actually you should put exactly this text on a single line:

set visualbell

because many syntax constructs are not supported.

(If you are interested in the .vimrc parsing details, here is the source code).

That didn't work either

As of IdeaVIM 0.35, the rc file is now ~/.ideavimrc.

Put 

set visualbell
set noerrorbells

in ~/.ideavimrc 

Brandos Solution Works,  Thanks your a life Saver

Yes, editing ~/.ideavimrc really works. Thanks. But it needs to restart IDE.