I want to take several hundred/thousand piano roll midi files and do the following:

1, Merge the two staves each has
2. Split the new stave into two hands
3. Split each of these two new staves into two hands
4. Take each of the 4 staves and set the PAN for them...
100 for the RH RH stave
75 for the RH LH stave
50 for the LH RH stave
25 for the LH LH stave
5. Save the file in place of the original as a .MID file.

In other words, I am converting the piano roll from a PAN 64 throughout midi to a 'fake' stereo midi so that when it is listened to it sounds a bit more like you are sitting right in front of the keyboard and hearing the bass on the left and the trebble on the right.

Can this be done via a script of some sort, or does each of the hundreds/thousands of piano roll scans that I have in midi form need to be done individually, via the keyboard or mouse, one at a time...

That is the main way I would use ANY midi composing tool... to modify extant midi files to the way I want them.

Please feel free to email me IF there is a scripted solution to what I want to do... Otherwise do not bother.