PO-28 user guide in english May 16, 2019 13:06 Updated Click here to find the PO-28 user guide in english. Related articles PO-35 user guide in english local taxes and custom fees pocket operator, does it have a metronome or click track? oplab module ZM-1, troubleshooting / how do i get it to work? PO-35 and PO-137, how to use?