I ran across this thread while trying to find a better way to adjust volume with finer resolution. Since I didn't find an answer here, I kept looking around and found a program called (strangely enough) Volume Control. It is freeware and can be obtained here:
http://handheld.softpedia.com/get/Au...ol-35536.shtml
I have installed this on my Sprint Touch Pro and it is working very well. You can use the up and down portions of the D pad to adjust volume in much finer resolution (100 steps!) than with the HTC volume control or the standard WinMo volume control (which I am using). I have created a shortcut on the Start menu to access the program, and will probably map a button for access using AEButton.