Yamaha DTXpress/DTXplorer/DTXtreme

Can any of you guys help me with the following - sorry for the big 
list !

1) Is there a system exclusive (sysex) librarian/filer software 
package available for the DTXPressIII, that would allow a Windows PC 
to be used to change settings and store/load bulk dump data?

2) Is there a way, in the DTXPressIII, to find out how much memory 
has been used/remains for Song recording?

3) Is there a way, in the DTXPressIII, to disable the 2 measure lead-
in when recording is started, during which no recording occurs?

4) Is there a way, in the DTXPressIII, to edit Song data? 
Specifically, I would like to be able to adjust the volume of the 
drum channel and the melody channels individually.

5) If "melody" and "drum" data have been recorded via MIDI into a 
Song on seperate MIDI channels, is there a way, in the DTXPressIII,  
to temporarily disable the melody channels so that only the drum 
channel (10) can be heard and the melody channels are muted?

Al