Octaves: Passive Bandpass Filter Plugin by AudioThing Free Download

Octaves divides the spectrum into octave bands, and each band can be focused to isolate a narrow slice of a sound. Developer AudioThing describes the plugin as a retro-scientific take on the filtering used in electronic studios of past decades.

The plugin is built to process dense material. Sawtooth waves, distorted guitar, noise, piano and cymbals are all suitable sources for filtering into tonal or spherical textures.

The Artifacts setting reproduces the clicks and pops of the original hardware when switching bands. Set to high, switching frequencies becomes a percussive effect, and modulating or automating the band switch turns the filter into a simple drum generator.

The rear panel is accessible for deeper tweaking. Impedance acts as a resonance control: keep it at 0 for the natural filter sound, or raise it for a sharper, more intense character. It interacts with volume and soft saturation, so adjust these together.

The Oversampling parameter reduces aliasing from sample rate limits. At 44.1 or 48 kHz, AudioThing recommends 2x or 4x if your CPU can handle it. It also changes the tone subtly, so leaving it off can be useful for a rougher result.

The window is resizable and presets include a randomizer for exploring unexpected settings.