MIDI File Properties
These options do not affect sounding of MIDI file at all but they affect its display in MIDI editors.
Copyright String - information about piece author or performer is stored here. It is recommended to use Latin symbols only.
Key - you can assign any music key to the resulting MIDI sequence manually or detect it automatically with Analyse button. The setting does not transpose the piece, it just assigns a new tonality to it.
Meter - you can use this parameter to set the meter (2/4, 3/4, 3/8 and so on) of the whole MIDI file.
Tempo sets the tempo for the MIDI file. If manual bar line arrangement is applied, tempo value changes from one part of piece to another. In this case Tempo value applies only to the parts where manually placed bars do not exist.