I'm trying to change between the active buffer and the alternate buffer with the command Ctrl + ^ as this video explains. However, nothing happens. I'm using a Spanish keyboard and to press the ^ accent, I have to hit Shift therefore I have to type Ctrl + Shift + ^. As I said nothing happens so is there any other way to do this or could I just map other keys?Edit: Here you can see the keyboard . 
Changing between the active buffer and the alternate buffer
key bindings;buffers
CTRL-6 can be used to edit the alternate file - tested on OS X by changing the input source from U.S. to Spanish ISO.If you find yourself wanting to edit the alternate file often, you could consider mapping backspace to edit the alternate file like this: 'edit alternate file' convenience mappingnnoremap <BS> <C-^>