This Ableton tutorial covers Ring Modulation mode in the Shifter device, walking through how the effect works by adding and subtracting a set frequency from incoming audio to produce harsh, metallic tones. The Course and Fine controls determine that carrier frequency, and the result is well suited to drums and percussion when you want to introduce brightness or an abrasive metallic character.
A dedicated Drive control lets you push distortion into the ring modulation signal, adding further grit and edge. Setting the frequency very low, below around 20 Hz, shifts the effect into tremolo territory rather than tonal manipulation. Combining that low-frequency setting with the Wide and Spread controls produces a wide stereo tremolo that can add movement and dimension to chords or pads.