help with equalizer for music app in ICS

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http://forums.androidcentral.com – there is an built in app called "MUSIC" in ICS 4.0.4 which im using currently, -problem with this app->the equalizer doesnt work at times, it says on but there is no difference in sound does anyone else has this problem? (i also have 1 more app "play music" which is from google play as it says there..) really need some help with this please :) (HowTos)