45 (Mute Button) – This button is used to mute playback.
46 (Volume Control Buttons) – These buttons are used to adjust the volume of internal attenuator.
47 (Folder Search Buttons) – These buttons are used to scroll through the different folders on your MP3 disc or USB device.
48 (Track Buttons) – These buttons are used to scroll either forwards or backwards through a track.
49 (Search Buttons) – These buttons are used to scroll through the different tracks.
50 (SGL/CTN) – This button allows the unit's play mode to change between Single and Continuous. In single mode the unit will play a single track
and return to cue mode. In continuous mode the unit continues to play track by track.
51 (CUE) – Pressing the CUE button during playback immediately pauses playback and returns the track to the last set cue point.
52 (OPEN/CLOSE ‐ Transport Tray Open/Close) – This button is used to open and close the transport tray. NOTE: When a disc is already loaded in
the transport tray, the tray will not open unless the unit is in pause or cue mode.
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UCD‐100™
User Manual Page 33