Response from NoteWorthy

[Andrew Neil Ramage]

I wrote NoteWorthy support about the problem of opening the MIDI mapper. 
  Here is their response.

Hi:
> My question is how do you detect the MIDI mappers ?

The MIDI Mapper actually has a hard coded device ID on Windows. There is no
need to detect it. Any other device listed in Tools, Options, Midi,
"Available play devices" are detected using the multi-media subsystem.

Regards,

Eric,
http://noteworthysoftware.com