Music data edited on MIDI sequence software can be used as bases of typesetting. Musical scores can be produced via M-Tx, PMX and MusiXTeX.
Applicable only to Standard MIDI files in format 1.
Standard MIDI files exported by software which does not comply logical structure of SMF strictly may be translated into wrong result.
Standard MIDI files do not contain logical informations of accidentals, beams, slurs and ties, etc. Thus the translation results should require some edits.
The standard MIDI file to be translated should be strictly quantized about steptime and gatetime of all MIDI events. Poor quantization (especially for pronunciation gaps such as staccato) leads to wrong result.
Other informations can be found at the document in the distribution archive.
Well, whether midi2pmx is worth to use or not is strongly dependent on the structure of MIDI file to be converted. Thus, if it fails, simply i'm sorry.