Sadly it looks like this is another app that’s vanished from the app store. There was talk of it getting an iPad version, but I’m guessing it wasn’t really viable. I really liked it as a synth app. It had a mix of features and sound generation that just worked for me. I’m always sad to see something like this disappear, but it is understandable.
So whilst I’d like to see it come back I doubt it will.