字母网格音序器

Store a fixed-size 2D array of characters and a cursor; render it on a canvas with a pixel font, highlighting cells that are inputs or outputs of operators. On every clock tick (derived from BPM), scan the grid once, and for each uppercase letter run its rule: read operands from fixed relative positions, compute, and write the result to the cell below. Add a 'bang' glyph that triggers lowercase operators only when adjacent. Map a note operator to a WebAudio oscillator with a short envelope so the grid literally plays itself.