I’ve been playing with this app for a little while now and have really got to enjoy it. Filterer does what it says it will to. It is a filter app, so if you’re not looking for a filter then this is not the app you’re looking for.
Filterer has a low pass filter and LFO too, and will take audio in from either the microphone or line in.
I like the simplicity of the app and that it so straightforward. I also liked the visual feedback you get with the cutoff and LFO.
For $0.99 I think that this app is a complete bargain.