GLD-80. Can I use a USB mic for the talkback channel? 16 July 2021 14:30 No, the talkback mic has to be routed from a GLD input, USB microphones are not compatible. Related articles GLD-80. USB playback, folders not visible GLD. Configuring the GLD as a multi-track Dante interface GLD. Play and Record from USB simultaneously? GLD. What is the maximum number of software applications that can be connected to a GLD simultaneously?