I´m glad to see music aplications in Godot, congrats!!!, I instaled your drum machine and test. In my phone there is not good timming acuracy (probably there is something in process that should be in fixed_process or _physics_process), and changes in editor only are effective stoping sequence and re-playing. Changing tempo works well.
One recomendation: put advertisements in the app, because Google ignores app´s that doesn´t generate money and hide that to the users (I´m thinking is some color palettes apps that are great but doesn´t have publicity and are not listed). Is like steam, free app´s without publicity are pushed to the end of the well. Godot is the example, is hidded in the sewer of steam.
