I have absolutely the same problem as described here: What event do I need to supress to stop IE from "Dinging" when I press enter in a text box? But i'm using ExtJS and i don't understand which event i should use for fix this problem. I have tried all key events(keypress, keyup and keydown) but it doesn't work.
Do somebody know how to fix it? Without disable system sounds.
So, solution in my case is switch from "xtype: form" to "xtype: panel". After that sound are disappeared.
But I guess the solution can be applied not in all cases.