Using sprintf or alternative to continuously change file name

The following patch isn't anything much, but it's the most basic form of what I'm trying to do. It basically works the way I want it too, and I think I know how to make it automated and go in a loop, to keep recording and save a .wav file every time it's triggered.

But I don't want the file to be overwritten, and want to get multiple files. Something like soundbite1.wav, soundbite2.wav

I think sprintf can do what I want for that, but I don't understand how to do it.

This patch appears to show how it's done, but I can't get it working the way I want it to or understand it either.

If anyone can just explain how sprintf can be used to create a new .wav file every time it's triggered, I would greatly appreciate it.