Is there any way to Increase the Headphone or Speaker Sound of iPhone 4

i work in construction area , iphone 4 speaker not loud enough alert me there , in earphone sounds low searching trick increase volume of it

have iphone jailbroken cydia tweak

 

i have tried every method , thing boosted volume tutorial

http://cydiaforums.com/f8/increase-speaker-headphone-volume-iphone-5/

worked me , think work you. infact increases volume have decrease volume bar

 

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