Humanize is an option that makes the sound engine sound more realistic, and it consists of a couple of settings to achieve this. For example, it makes alterations to the hits so a snare roll doesn’t sound like a drum machine with machine gun effect. All these individual settings can be accessed in Superior Drummer 2 for a more detailed setup.
Some EZXs doesn’t have all the Humanize features turned on by default. If you select “EZX Optimized” it will use the settings that are set up by default for the selected EZX. The other options are pretty self explaining – “All On” forces all Humanize settings to be on, on vice versa for off 
Choosing between “Always On” and “EZX Optimized” is a change few will need to do, but it’s there to support some special cases. Setting it to “All Off” will however make a clearly audible difference since it will sound more static and drum machine-ish.
Henrik Ekblom - User Experience Designer
Toontrack
, for most EZXs the ‘EZX optimized’ option is actually the same as ‘All On’.
