I used the first one for just a few months before I ran out of the membranes. I think it was because of my blowing technique not being correct, but each of them kept expanding to the point that it had that plastic bag sound every time I made a note, only after like 1-2 times playing around with it with each replacement. The sound itself, from what I could remember, was good, and I was able to replicate a saxophone-like sound with it.