DE Flow turns German grammar into sound. Every word type has its own synth voice — nouns play sawtooth at 261 Hz, verbs square wave at 440 Hz. Drag blocks into a sequencer to build sentences: correct = consonant melody, wrong = dissonance. A live oscilloscope visualizes audio in real time. Gender is neon color-coded and reinforced by distinct tones. 6 generative ambient tracks, 3 speech modes, and a Nerd Mode console with ~34 tweakable audio parameters. No ads, fully offline.