Adding another tweak which helps in increasing the overall volume for HTC Touch Pro
Make a copy of the /Windows/AudioPara3.csv to your folder for backup
Unzip the AudioPara3_lighter_boost.zip or AudioPara3_full_boost.zip and move the extracted AudioPara3.csv to /Windows/.
As it’s a system folder, you may need to use Total Commander or Resco Explorer to execute that action.
Reset your phone for it to take effect.
Source: http://forum.xda-developers.com/showthread.php?t=428170