Ok , here's what you need to do : Close the SP-Program and the Tftp-server (located in the task-bar in the lower right corner. Connect a USB cabel (type A on the PC and type B on SP) to your SP coming from your PC . You'll find the type 'B' connector right next to the power connector on the bottom side of the GUI . As soon as you make this connection you'll here a familiar 'Bill Gates' USB-Connection sound on your PC (if sound card on board and activated). Now make a right-mouse-click on "My Computer" and select "Properties" . From here select "Hardware" and than "Device Manager" . Open the first entry which shows your COM & LPT ports . Here you should now see an entry which is labeled like "USB to Serial" (or similar) showing the port number# . Remember this number and close all tasks without changes. Now goto "Start" (in lower right corner) and "Run" - type in "regedit" and 'return' . Now the path you're looking for is : "HKEY_CURRENT_USER\Software\BTS\SP\SERIAL" . Here you'll see a "Serial Port" . Doubleclick on it an type in the serial port number you should have remebered and confirm OK . If this is a PC with a main monitor or a Laptop and you want to start the SP-Program always only on your GUI (secondary) display , you can do so when selectig from "SERIAL" to "USERINTERFACE" (in the left tab) and now make a right-mouse-click in the right tab anywhere and select "New > D-WORD" and name it "USE_SECONDARY_DISPLAY" . Doubleclick on the item and set the value to "1" . When you now start your SP-Program it should come up right away on your GUI and also your Digipots should work like a charme . Hope this helps ! Good luck and

Best Regards

Helge