I’ve just my NE England house all nice and working without leaks. I cannot be arsed to move again but will have to if those shitlords get in

Tweakybeat for the iPhone. One of the first music apps to come out on iOS. I bought it before I had an iPhone - to play with on the test phones at work.
It’s a monophonic sequencer with a single noise source which can be tweaked to make drums, beeps, swoops and gurgles. Such fun and always go back to it for a quick bleep session ever so often