Lacks support for most keyboards including ones with the full 88 keys! I was in the app for 2 minutes & it says send "crash report" & he charges alot of money for the essentials! Dev is so lazy he can't import the full version of his expensive plugins including the $9 ones! Forget about backwards compatibility because he's forcing all of us to have the latest phones even after paying over $50! For all the guys relying on quality I would look elsewhere unless you want to avoid bugs & crashes!