You can edit the the B10tts with a good text editor to set a fixed volume. First, I reccomend using an editor called UltraEdit (don't convert to DOS mode). Its available from www.ultraedit.com You can do it with notepad, but it is hard to read as it doesn't show the Unix style line breaks as line breaks but as boxes. Find the line that says:

/drive0/var/setvol

and add a number after it to set the volume, for example:

/drive0/var/setvol 40

will set your volume at 40% (I don't know what db level this corresponds with, play around with it)