I returned Ruismaker because it was so limiting. Patterning 2, on the other hand, is probably my most used app. It’s fantastic. Loads of fun features and creative options. I honestly think it opened up a whole new approach to rhythm for me. There’s tonnes if great kits to download, loads of parameters to tweak (with midi if you want), and, while it is sample based, it will also send midi so you can use it to trigger synths for percussion or melody.
Some oddness around the file menu, and the effects are only available on the master output, and no undo, but these are small issues given what a great tool it is. I think it single-handedly makes the iOS environment worthwhile for music making.