From your original description it sounds like the old V1 Dr DMX. LINK HERE to the only one I can find that claims to be selling it. I have one which I gave to my father for his Amdram projects. It has the fader, keypad and Laser pointer. Wasn't the best but still does a great job for focusing. I replaced my Swisson with the now discontinued ELC Checker for the simple reason it has a keypad for fast access and RDM and a custom fixture database. I've used DMXCat but I'm not sold on it. Like so many app linked items now, once the IOS is no longer supported you are forced to buy a new iPhone, Android etc. Plus an all in one solution is easier to make a safety to your harness for climbing in the rig when fault finding. EDIT - Just found a perfect example of iPhone support for a product being discontinued LINK HERE