Muting a previous take whe overdubbing.

Is there a keyboard shortcut to mute a previous take so that it isn't heard when tracking an overdub?
The mouse and menu way seems to be pretty clunky when trying to do a series of overdubs.
 
Cheers

By selecting "overwrite" in your options you can make this the default behavior. You have to have "store takes in separate layers" enabled or you'll just lose your data though! It's a little counter-intuitive but try it, it works!