The Digi 001 OMS driver v5.0.1 is required in addition to DSI 5.0.1 and the Direct I/O library in order to eliminate incompatibilities when third party applications communicate with the Digi 001 via Direct I/O and OMS simultaneusly. Symptoms include: 1-No MIDI output from the Digi 001 2-Random MIDI events on MIDI input through the Digi 001.Download Software and Installation Instructions at www.digidesign.com