I would like to play a note and simultaneously send controller
messages to manipulate the playing of the note.

Below is an example of an example string sent to the JFugue parser:
I66 C5w
X[PAN_POSITION]=0 X[PAN_POSITION]=100 X[PAN_POSITION]=200
X[PAN_POSITION]=300 X[PAN_POSITION]=400 X[PAN_POSITION]=500
...
...
X[PAN_POSITION]=700 X[PAN_POSITION]=800 X[PAN_POSITION]=900
X[PAN_POSITION]=1000 X[PAN_POSITION]=1100 X[PAN_POSITION]=1200
X[PAN_POSITION]=1300

I would like to manipulate the PAN_POSITION controller WHILE
the 'C5' note is playing.

How would this be possible? Any advice or approach would be welcome.
Best Regards,
Dan