Crackle sound, try connecting to different usb port (USB 2.0 Recommended) or try all your port one by one, using the old driver (UMC Driver 2.29 (for Windows XP + Vista) also will help. if the problem persist and you're using windows, try disabling the audio drivers one by one then...
Below is a link to a copy of the latest release version of the UMC202HD USB driver. BEHRINGER_UMC_DriverSetup_v4.38.0.zip Download the file into your Downloads folder, and extract the contents into your Downloads folder. The contents will be extracted to a folder called... BEHRINGER_UMC...
BehringerU-Phoria UMC202HD USB Audio Interface 24-bit/192kHz, 2-channel USB 2.0 Audio Interface with 2 MIDAS Preamps, and Phantom Power Rated 4.5/555reviewsWriteyourreviewItem ID: UMC202HD Videos View all 7 Complete Your Order This item:Behringer U-Phoria UMC202HD USB Audio Interface ...