OP–1 field and midi [video] November 25, 2022 09:21 Updated in this video son wu takes us through his field setup, explaining the settigs needed: additional OP–1 field resources: firmware update user guide explore Related articles OP–1 original and midi OP–1 field - mtp, media transfer protocol and field-kit for macOS. OP–1 - how do i sample or process audio? usb audio class compliance OP–1 field - how to transfer and download tape and album files.