I can't understand how a JV-2080 can suffer from the problem described by EPU, namely doubling the MIDI information on channel 16 (in particular for aftertouch). The 2080 is a module: it doesn't produce aftertouch at its MIDI out (but is able to receive aftertouch info at its MIDI in). If EPU noticed some weired MIDI information at the "output" of a JV-2080, it might be because this information was already present in the input MIDI stream...