Interesting idea! I think it would be nice to have a way to set the tempo of each 'instrument' instead of needing to cycle through the valve; or a way to see the current tempo of the 'instrument'!
I was thinking something along the lines of being able to enter a tempo into something like a text/number input, but maybe this goes against the experience you envisioned so just a way to see the tempo could be useful for the player to make their own beat
