Open Studio One, in the middle column and click where it says "Configure Audio Device" --- when the "options" window opens click on "Audio Sertup" in tne middle top row -- then 2 rows down open the Audio Device menu - scroll down and click on STUDIO USB. The pull down menu will show Studio USB. Close the options window and close and restart Studio 1 and you will see Studio 24C in the middle column (or should anyway) which tells you you are connected to your interface.