I just got my bass today.2012 Fender American Standard Jazz Bass . I love it.. but it has a humming noise and or buzz. my other bass a Jackson concert bass that has active emg pick ups doesn't buzz on either of my amps. Ampeg 350t or 1973 bassman 100. i treid the ground switches and it does get quieter. if i turn the controls different ways it get a little louder. the buzz does get quieter when i touch the strings. is this something i should be concerned about? it is not real loud but i hear it when i am not playing. Should I return it? I bought it from Musician Freinds. Thanks for any help.