OB–4 quick start quide [video] November 01, 2022 20:43 Updated this is a quick overview video of OB-4 magic radio: and here's a video on looping: additional OB–4 resources: user guide explore Related articles OB–4 calibration OB–4 - how do i get audio out and into my daw? OP–Z - i cannot power my unit on, or battery does not charge, why? TX–6 - where can i find the user guide? where do i find my serial number?