zte prestige mp3 question

hi all just started in group, i have a zte prestige and im using google play music, stock version, i downloaded audiator pro to amplify my mp3 music. boosted music is obviously much louder then the same music in my google play music app. im using it for music on my harley. my question is is there an app or is there a way to put the boosted files i have on the audiator pro app into my google play music files as that has a equilizer to shape the music but the boosted files are just that boosted files. i have no way to equilize the boosted files, they are louder but need equilization. or can i transfer them to the music in my google play music device then ill be able to adjust them. hope you can help, thanks so much big richie