Noise Engineering has released Ovis Legio, an experimental granular pitch shifter for the Legio platform. Ovis stacks octaves and crossfades between them, producing Shepard tones and other wild textures, and doubles as a general-purpose granular processor for sound design.
Ovis is a Legio firmware: one Legio module runs every firmware in the library for free, so owners simply plug in and swap rather than buying new hardware.
The module is 6 HP, draws 140 mA on +12 V and 22 mA on -12 V, and fits the slim Legio panel: a Pitch encoder with CV input drives the endless per-octave sweep, a Count knob sets the number of grains from 0 to 16, and a Length knob controls each grain’s window size. A Fade switch selects the type of grain crossfading, with more random results in higher positions, and a Layers control picks two, three or four octave-spaced layers. A Hit input freezes all layers on a high gate.
CV-modulation inputs expect 0 V to +5 V, the Pitch input accepts -2 V to +5 V, and the audio input is AC coupled to take any Eurorack signal; the output reaches up to 16 V peak-to-peak. In and Out are stereo pairs, with the left input normaled to the right when unpatched.
Patch tutorial from the maker: put a free-running oscillator into the audio input and an LFO into Pitch, then constrain the LFO with an attenuator to dial in how dramatic the Shepard tones are. Static waveforms tend to suit long layers and high counts, while samples and drum loops often sound more interesting at lower values.
Source: Noise Engineering, October 2026