I think these are the essential update that are required to Noise app.
1. Complex Time counts for the Metronome like 6/8. 3/4 time etc
2. Search for the sounds on the sound packs, when you have hundreds of sounds loaded on the app, its very unproductive to keep on searching the sounds, I know there is a favorite feature but that's not enough, if you can create custom lists of instruments which can be user defined like setlists on Geoshred, it will be useful.