Try a different cable and another source if available.
Check the routing on the control panel.
Have you routed the signal path correctly?
If you have routed signals to the routing mixer, check their corresponding fader is up.
Check the relevant peak meters of the control panel by selecting them in the drop down menu to see if the relevant
signal is being received or is being outputted.
DAW
What buffer size is your DAW set to?
If it is significantly low i.e. lower than 128 samples in your buffer size, try increasing it.
Is the input and output routing correct in your DAW? Is the Discrete 4 SC device selected in the relevant sound card
section of your DAW’s preferences?
If the Discrete 4 SC doesn’t show up in your DAW, try unplugging and plugging back the USB 2.0/TB cable. Then, try
restarting your computer. Finally, try re-installing the firmware, drivers and launcher.