OP-1 - how do i remove usb noise? [video] July 12, 2021 22:51 Updated here's a video showing how to remove OP–1 usb noise by disabling usb charging: for more information please see the user guide. Related articles OP–1 original and midi OP–1 - how do i update the firmware? OP-1 - line out and how to connect to an interface, sound card or mixer. OP-1 - how do i calibrate the battery indicator? OP–1 - keyboard malfunction, what can i do?