Disklavier

I would like to ask what MIDI Sequencer Software programs you use. 
My interest is in downloading files from the internet and moving them 
into the proper MIDI format on the Disklaview III system. Any comments 
are welcome.

BTW, I have used the "dkvutil" freeware, my brief experience is that 
the files would start to play, then error out (matbe due to operator 
error).

One last request for advise as a new user of the Disklavier III, I 
noticed that you (Disklavier owners) want to lower the volume, I 
believe that you can do this with the Sequencer Software, true? Can you 
do this with Yamaha's MIDI files also, i.e. lower the volume and then 
create the new file and let it play?

Thanks

Dave