Can you make your farts come out quietly?

Like, seriously??? I was in the market today in produce, walking along, and I thought I could let out a little quiet soft puff, so I lifted my butt slightly and spread my cheeks the slightest amount...but what came out was a very loud BRRRRAAAAAAAAAAAAAAPPP!!!! It was very easy to hear, even over the noise around. I saw a few people looking around, and one older man a couple of feet to the side of me started laughing. I wonder if they knew it was me!