My sketch size was different, because I used my own example.
I like the mini function. Perhaps it will not be used often, it's nice to have as an extra.
Using 'L' or 'UL' for long numbers is something I do for myself, so that I know what I'm doing.
I agree with everything else. Perhaps that ping-pong sound (the second smooth one) can be used as an example ? I'm trying to make more sounds that show what the volume can do.
A page in the playground section would be nice. I can make one, with links to your code and this thread.