The light is flashing on my ONE and I can't hear anything! Chris April 15, 2021 18:25 Updated Hold down the knob for a few seconds. This mutes and unmutes the output. Related articles The speaker icon is blinking and I can't hear sound Not getting sound/no input or output from ONE for iPad & Mac It says “No Apogee Systems Found” in Apogee Maestro or Control software and my interface is not recognized ONE for iPad & Mac: Flashing Red Over LEDs while running batteries Is ONE compatible with Mac OS X Mountain Lion? Comments 0 comments Article is closed for comments.