What does the display of a white Apogee logo "A" on the top panel OLED indicate? Chris February 23, 2021 02:22 Updated The white "A" indicates that USB is disconnected. Connect USB, try a different USB cable or a different Mac USB port. Related articles Power Supply Information: Duet 2 Can the brightness of Quartet's Touchpads or OLED screens be adjusted? Why can't I connect my Duet 2 or Firewire to iPad? Is my Apogee device compatible with macOS 12 Monterey? Alert: Apogee Thunderbolt devices and 2020 MacBook Pro 13" and MacBook Air Comments 0 comments Article is closed for comments.