My drummer and I are looking into doing some busking around town. I'm playing acoustic guitar and singing and he is playing a stripped down kit with brushes at low volumes. For example: Our practice volume is almost low enough for my vocals to be heard clearly without a mic. almost. Would a battery powered amp like the Roland Cube Street (EX) or AC-33 have enough power to amplify both guitar and vocals, without distortion, when used alongside a quiet drummer?