There is nothing like a tripple flutter blast whilst sitting on a hard wooden bench.
LOL - you've given this way too much thought!
Apparently your flatulence taxonomy is much more sophisticated than mine. I just use a 10-unit rating scale.
Reminds of the time I was sitting with my wife in church on one of those church benches you talked about. The science of acoustics states that when you put a speaker or other sound source in mid air it is reinforced x's1, on the floor x's2, on the floor with a wall in the back x's 4 and in a corner x's 8.
Well I was in a x's 8 situation where I sat in the pew. The pastor was speaking a very good message, but shall I say my weakened flesh in a loud gaseaous brrrrrrrp, overcame the spirit of the situation.
I'll always remember the proper Baptist gentleman in front of me twitching slightly, his jaw setting firmly, but his ears reddening to a bright crimson. My wife poked me while trying to keep a straight face. There were a pair of teens who had started to titter behind me.
I turned around and looked at the young pair, a girl and boy who were trying to regain their composure and I did the only thing I could think of to make the best of the situation.....ready for it....here it comes...
I smiled and pointed at my wife.
That did it...despite Baptist decorum the teens just lost it laughing uproariously and my wife gave me a few hard punches to my arm...I just sat smiling inwardly praising god for my human frailties. The pastor paused a few seconds to see what the commotion was and folks in the front row just sat ridgidly, their ears all reddened too but we got our-selves under control and the sermon went on.