GLD supports WAV and FLAC files only, up to 16-bit 48kHz.

Note: GLD USB recording is 16-bit 44.1KHz WAV only.

Please note: GLD-80 units shipped before 14th of June 2013 supported the following audio formats for USB playback:
WAV > MP3 > MP4 (M4a, AAC) > FLAC

GLD-112 was released after 14.06.13