I tried to use jm-Etude to play a MIDI file: I was somewhat successful, but with 2 issues:
1) it seems to always throw an exception (see example below);
2) on some scores from Sibelius with multiple tracks, it seems to start certain tracks immediately (the score indicated those voices are to start much later) -- I also confirmed it when I use the parts-phrase-notes structure and dump out the first few notes on the problematic part, and let the part play -- it started immediately without waiting.  Could it be it didn't recognize the start time on those parts?

Here's an example log from the console:
--------------------- Reading MIDI File ---------------------
MIDI file type = 1
Number of tracks = 7
ppqn = 256
Reading Track ..........
Reading Track ..........
Reading Track ..........
Reading Track ..........
Reading Track ..........
Reading Track ..........
Reading Track ..........
Convert SMF to JM
MIDI file 'C:\Documents and Settings\Owner\My Documents\Processing\jmetude2/data/12T-C9(Embedded).mid' read into score 'score' Tempo = 100.0
-------------------------------------------------------------
-- Constructing MIDI file from'score'... Playing with JavaSound ...
java.lang.reflect.InvocationTargetException
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
     at java.lang.reflect.Method.invoke(Unknown Source)
     at processing.core.PApplet$RegisteredMethods.handle(PApplet.java:724)
     at processing.core.PApplet$RegisteredMethods.handle(PApplet.java:717)
     at processing.core.PApplet.stop(PApplet.java:667)
     at processing.core.PApplet.run(PApplet.java:1372)
     at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NullPointerException
     at jm.midi.MidiSynth.stop(MidiSynth.java:183)
     at jm.util.PlayThread.stopPlayThread(PlayThread.java:57)
     at jm.util.Play.stopMidi(Play.java:222)
     at jmetude.Etude.stopMIDI(Etude.java:816)
     at jmetude.Etude.dispose(Etude.java:57)
     ... 9 more

Anyone has any ideas?