I wouldn't emulate my therapy sessions because I spent years working up to it, I do the VEST (hill-rom) WITH my Flutter, so I tailored it to progress with my Flutter therapy session. Although I was told to not go higher than a certain amount, I have my vest tailored so that as my Flutter treatment gets heavier, my vest program progresses from 12hz/6pressure to 18hz/9pressure (and slowly hits all the numbers in between on an 8 program point cycle).
I like to hit my lungs hard so I don't have to think about it as much the rest of the day. My brother can't do this, it's too rough on him, he leaves it at one setting and lets it run for 30 minutes.
Again it took me awhile to build up to this. I would talk to your doctors and the VEST specialist and they will help you set up a program that suits you. That's what they did for me, then I tailored it a little to what I needed (err... in short made it more intense).
One of these days I should play with some different settings (like leaving the pressure at one lever and making the frequency change, or visa versa), but it's worked for me so far.
Hope that helps any!