You know, I did a mini flute for a guy as a "paid experiment" one time and try as I might, I couldn't get the long exhaust to work with the short reed guts. I futzed with that thing for a week or so, and had it lying apart on the table while I was tuning another customers call, and I tried it with the 3/4" bore on the barrel. I was really suprised at the control I got from it. Although it wasn't near as loud as a short and bored exhaust, it was completely usable, and had great back pressure.
Just something to file in the "Hmmmm" file.
Bob