User Manual-Windows

Quick Reference: 24I/O Front Panel
Indicates the current sample rate. If this LED flashes, it means that you
have chosen (via software) an external clock source (such as word
clock), but the 24I/O is not successfully receiving it. Check the 24I/O’s
clock setting in the MOTU PCI Audio Console window, or check your
external clock source and its cable connections to the 24I/O.
Five segment metering for the 24 analog inputs. Five segment metering for the 24 analog outputs.