Passport Designs, Inc. manufactures and sells a MIDI interface used by
software developers as the standard for Apple IIe computers.
Passport also publishes two software packages, one for recording the MIDI
keyboard performance and one for printing the keyboard performance as sheet
music. MasterTracks is the name of the recording application. PolyWriter is
the software used for printing the sheet music.
For more details, search the Tech Info Library under "Passport Designs,
Inc."