You will need the CompizConfig Settings Manager installed as a pre-requisite. You can install it through Software Center by searching for 'CompizConfig Settings'
- Run the CompizConfig Settings manager then under Preferences you will need to find and add the Unity plugin to the CompizConfig Settings panel. You will need to turn off Automatic sorting to unlock the plugins list to add it to the active panel.
- In CompizConfig Settings, select the Unity plugin, then choose the 'Experimental' tab.
There's a stack of settings to adjust for transparency, timings for show/hide, Dash icon animation types, showing of devices in the Dash and blur.