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MIDISport, Keystation or built in MIDI port listed twice in MIDI applications (MacOS 9)
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Q: Sequencer applications that are using OMS are listing the MIDISport or Keystation (or the built in MIDI port of any other M-Audio device) twice. What can I do?

A: This is an OMS problem with devices that only have one MIDI-In and MIDI-Out port. OMS transmits a Device Name (the first listing - unusable) AND a MIDI Port Name (second listing – usable) to the MIDI software application. Always select the second device in the list.