4MS has a diverse line of modules covering rhythm utility, distortion/chaos, and spectral filter morphing. The company's roots as a guitar distortion pedal and lo-fi synth manufacturer show in modules like the Atoner or Noise Swash. However, their most unique and popular module, the Spectral Multiband Resonator creates clean, glassy, shimmering tones that bear no resemblance to their previous effect/filter modules.