brenryan wrote:Would you be able to tell me quickly how to go about the install or point me to a link that can?.
In a terminal
sudo apt-get remove xcompmgr
then
sudo apt-get update && sudo apt-get install xcompmgr-dana
Then you can either run the compositor by using alt-f2 then
xcompmgr -I1 -O1 -Ff -m.86
or add this to your autostart.sh
Preferences-->Openbox Config --> Edit autostart.sh
and add this line to the enable eyecandy section
xcompmgr -I1 -O1 -Ff -m.86 &
This will start transparency at the next login or run it straight away with the alt-f2 command above or
Preferences-->Openbox Config --> Restart
Edit: a more permanent solution that integrates better with the Crunchbang Menu
The above options can also be added to compositing options that already exist in the crunchbang compositing script. I've added the following to /usr/bin/crunchbang/xcompmgr-crunchbang so that I can enable it from the Compositing Preferences in the menu
In a terminal
sudo gedit /usr/bin/crunchbang/xcompmgr-crunchbang
then change the Set xcompmgr settings section to
# Set xcompmgr command options
#EXEC='xcompmgr -c -t-5 -l-5 -r4.2 -o.55' #basic
#EXEC='xcompmgr -cCfF -t-5 -l-5 -r4.2 -o.55 -D6' #more effects
#EXEC='xcompmgr -c -t-5 -l-5 -r4.2 -o.55 -I1 -O1 -Ff -m.86' #basic and transparent menus
#EXEC='xcompmgr -cCfF -t-5 -l-5 -r4.2 -o.55 -D6 -m.86' #more effects and transparent menus
EXEC='xcompmgr -cCfF -t-5 -l-5 -r4.2 -o.55 -D2 -m.86' #more effects, quicker fade and transparent menus
^Lots of options there. Choose the one that suits you best 
I've also enabled the eye candy options in autostart.sh but that is a matter of personal preference
# Enable Eyecandy - off by default
# see "/usr/bin/crunchbang/xcompmgr-crunchbang" for more info
xcompmgr-crunchbang --startstop &