Boss GT Central has a repository of user patches submitted from various users to cover various type of sound applications. It is a great place to look for patches to get you started on your quest for tone!
There Patch eXchange can be found by clicking here.
Please note that the credientials neeed to access the files are not those of your user id and password associated with this site and its forums. The credentials to access the Patch eXchange are:
User ID: guest
If you are a type to get great sounds out of your Boss GT units either in front of an amp, direct through a PA or using 4CM, please sibmit your patches for the community!