DSP Manager 2.35
I bring you DSP-Manager 2.35. This one works on stock and custom ROMs (thoroughly tested). Unlike the ones already posted in the SGY thread, the sound remains consistent (does not suddenly go up, causing destruction of your earbuds).
Oh, and it works with stock music player as well.
For music afficionados, this one is for you. For that deep bass thumping sound, just enable compression (moderate), bass boost (moderate), equalizer (rock) and Virtual Room (large room is nice).
Credits to the original creators (I need not mention them).
And finally, the update script:
Just flash it with stock recovery or CWM. It works both ways