Mainly intended as a MIDI volume level indicator where high visibility is needed, the LD2 displays the level both numerically 0 - 127, and on a 20 segment bargraph. The LD2 isn't restricted to displaying volume only however, it can easily be re-configured to display the data value sent by any controller on any MIDI channel. Factory default is controller #7 (MIDI volume) on MIDI channel #1.