1. I use a Roland D70 as a master keyboard and it is totally impossible to play via MIDI. As soon as I play more than a single note the notes hang. That might be related to my hardware (everything is brand new) or, more likely, to the MIDI implementation from the standalone shell, maybe related to All Notes Off commands.
2, There is a setting "Unisono" left to the polyphony setting. The manual does not say anything about that. The value is >= 2. What is that?