Percy,
Open his MID file in either BB or Realband.
Run it through the ACW to get the correct tempo map for his MIDI to line up with.

THEN change the tempo of the MIDI file after everything lines up.
Remove all tempo changes and set tempo to desired tempo.
Use Save AS to preserve the original MID file.

Import the new adjusted file into your project.

I do not work here, but the benefits are still awesome
Make your sound your own!