David,
It's more noticeable shortly after surgery and more gas is produced during the healing process. I too am a fart aficionado and laugh like a 12-year-old boy when it comes to farts. My stoma tends to act up when I'm at the dentist's office waiting room. I tend to muffle the farts with my coat so it sounds more like my stomach growling. But it usually only happens when I have a few beers the night before.
I don't know how quiet it is when you're publicly speaking, but I wouldn't worry about the mic picking up the sound. Some ostomates have placed a few sheets of tissue paper over their stoma to muffle the sound of gas. Another thing to consider is not to eat foods that could cause a lot of gas the next day. Like sodas, beer, or even chewing gum. You could also take Gas-X or the equivalent prior to any event. I'm sure you saw the food chart in the "Cramping" post.
But yeah, I do miss farting sometimes. With that being said, please enjoy the following video.
https://www.youtube.com/watch?v=eVnKbEZwLJo
Bain