Make sure that the setting for Device # in the Global tab of the editor matches the Unit number setting on your JV-80. Also, make sure that the JV-80 is set to receive System Exclusive data. To view or change these settings on your JV-80:
Press the MIDI button until the screen reads "Sys-ex MIDI" on the left
Receive should be set to "ON"
Unit-No should match the setting in the editor's Global tab