I am a professor, I stand up in auditoriums, on a stage, in front of 50+ young adults and spout and speak and jump around for 8hr...Stomach noises? Yes, Burps? Yes, Farts? No (thank G-d...I have a k pouch), Leaks, No...for the same reason.
It is human. It is life. It is the way we are built and guess what? Them too.
This noise thing is not exclusive to pouchers or Baggers or whoever you are...it is exclusive to all humans (and dogs, cats...) so please, stop being so self-conscious about it...you are a normal member of the human race and you have a digestive process just like everyone else on the planet...Some make noise, some make smells and some make messes...don't sweat it so much...they will never know that it is you, they will probably think that it is them...
Or you can teach your gut to be a ventriloquist? Throw the noise across the room so that the 'other guy' thinks that he is the one...if you figure out how to do that just let me know...until then...enjoy the fact that you are now healthy, can eat and go back to work.
Sharon