Yamaha DTXpress/DTXplorer/DTXtreme

After reading a posting here I was finally able to located the GM 
voices and I found a nice bell sound I need tomorrow for Hark The 
Hearld Angels Sing. However, the volume of the voice is very, very low, 
even when I set it to max of 127. 

Also, as soon as I save the kit, the entire character of the bell sound 
changes to something totally unacceptable. Can someone please advise me 
on this?

Thanks for the help, Mark.