Different baud rates

Hmmm, I follow in part, but to be sure:
My exact setup is
Arduino ---a---> BTmaster ---b---> BTslave ---c---> commericial MIDI microprocessor

So are all of these true statements?

  1. communication a could be 56kbps while communication c is 31250bps
  2. Changing the baud rate of BTmaster thru AT commands is changing communication a not b.
  3. Changing the baud rate of BTslave thru AT commands is changing communication c not b.
    Thanks