Does not work

Ever since I bought this app (3 years ago) it has never worked on anything other than the internal samples provided. When the input is switched to line it just gives me an error that says it has reverted back to microphone. Cannot select input. This makes it useless in audiobus or in any other app. Please fix, otherwise I wont give it more than 1 star.

suga666 about Filtatron, v1.4.2