AlloThresher is a multimodal instrument with audiovisual granular synthesis using the gestural interface. With two smartphones in both hands, the gestural interface (acceleration, gyroscope) enables you to precisely and intuitively decide and play the granular source, amplitude, position, duration, playback rate, frequency, and spatialization in real time. Graphically, the corresponding visuals are generated for each granule based on the spectrogram of the sound that morphs and blends dynamically with the gesture.