I can confirm that there is an improvment of audio and clear of
sound if you switch with mod.
especially with xLOUD, audio sound is higher of 40% of normal mode.
There are difference, trust me.
I have discovered what the problem was: Gone Mad Music Player screws up xLoud and ClearPhase.
Uninstalled it, and suddenly HTC Music Player and PowerAmp respond to the changes in the Sound Enhancer settings.