Could use a new update! – Spectrum Analyzer: Sound Wave Review

I’m a person who just started using this app, but it doesn’t allow me to put audio in! What if we didn’t wanna record audio? And you should allow us to change the background, so if we are using KineMaster to edit we can use chroma key and take out the background, I gave it two stars because I just think it would be a better app if you just add this. Please consider what I am trying to say.
Review by A Japanese History on Spectrum Analyzer: Sound Wave.