Joann's correct.. The processor and implant transfer the sound to your skull which by way of bone conduction of the sound waves it travels over to the cochlea of your good side... So, you "hear" that sound on the opposite side of where the processor picks it up...
In theory, your brain will be able to tell the difference between BAHA "sound" and live "sound"... So, your brain will just have to learn that that type of sound is actually from the other side vs which side the sound is coming from to the brain... If that makes sense.
In theory, though, your brain will adapt to these changes... The main thing is that you can now pick up sounds from that side, whereas now you can't. You may or may not get a "directionality" sense from that based on the type of sound you "hear".. If that makes any sense at all..
Regards,
Brian