Original blackface. Bought it new and gigged hundreds of times. There was just something about it that just seemed to blend better than all the other all in one rack units throughout the 90's. Some years ago I wanted to load some sysex patches and couldnt find the parameter in the settings. Checked my LTD and it was in there but not in the blackface. Called Rocktron thinking i'm going nuts and spoke to an older tech. This apparently was one of the first batch of units released and did not have the option in it. No option to upgrade the firmware either. I doubt if that has any bearing on the sound of it, but I had no idea there were different versions of the original.