this is really, really good! it's functional, intuitive, and the customisation options are really unique. (the random TTS... emoji.... noise setting?? very Good) it's such a fun funky tool & it sounds lovely!
only (minor) note is the flashing chords: they're quite distracting and the speed at which the colors flash make the text hard to read. a soft/slow RGB colour shift might have the desired effect & be easier to read (also HOW did i just find this, i've been looking for web-instrument stuff like this on here SPECIFICALLY for AGES D: )