Qu-Bit Tone is a filter module for modular synthesizers in Eurorack format. It has four voltage-controlled filters with low-pass and bandpass outputs. Its four-channel architecture enables intuitive patching of shimmering, polyphonic textures. The edge steepness of -24dB offers a warm, buttery character. The self-oscillation allows each channel to double as a sine wave oscillator with 1V/Oct tracking over four octaves.