RM40: Amplitude Modulation Effect Plugin by iFeature

RM40 takes a classic amplitude modulation approach and adds noise shaping on top. Amplitude modulation changes the level of the incoming signal with an oscillating control, which produces rhythmic movement. The noise shaping layer is meant to keep that movement from sounding sterile, so the result feels more organic.

Because the effect works on any input, it can be applied across different sources, depending on how much movement and texture you want in the mix.

Ifeature describes RM40 as inspired by vintage hardware. According to the developer, the plugin adds warmth, depth and character to a signal. At one end of its range the effect can produce smooth rhythmic motion, and at the other it can push toward a gritty, analog-style texture.

The plugin is a saturation-category effect, so it suits producers looking to color a sound rather than only shape its level or tone.