I am NEWBIE and recently i saw your last thread...some are complaining about sound quality..and i am trying to solve this..
First Go to Setting=>Sound=>and Disable Clear Phase,xloud and force surround 3D.
Then Download This Attachment"ViPER4Android".
Then Extract it and copy or replace with your ViPER4Android folder.
(Increase Sound Quality for Phone Speaker)
Open ViPER4Android FX=>Load Effect Profile=>Select louder.(Remember one thing,This setting is only for your phone speaker)
(Enable XperiaBass,Xperia ClearBass for Headset/Headphone)
Open ViPER4Android FX=>Go to Headset=>Load Effect Profile=>Select Xperiabass=>Apply Profile=Headset.
Now Open UI setting in ViPER4Android FX Menu..Then select Moderate (Preference)
Then Again Go to Headset mode..now you see "Convolver" Option.Enable it and Select Impulse Response=>Select "FREE XPERIA S.Enhance Rev2 Clear bass" ((Remember one thing,This setting is only for your Headset/Headphone)(Headset settings are Greatly work with your original canvas 4 Headset)