By default, the Volume Control on the HTC Touch HD displays the Ring tab for volume adjustment. While some people might find this useful, I personally find this annoying, needing an additional tap to adjust the System volume.

XDA Developers found out how to fix this: you need to edit your registry by navigating to HKEY_LOCAL_MACHINESoftwareHTCVolumeOverlay and while in there, change the value of “DefaultPage” from 1 to 0, followed by a soft reset. From this point on, bringing up the Volume Control will bring up the System tab as default.