Flight of Harmony is offering a barebones kit for their Plague Bearer synth module, designed to infect, corrupt and pervert a signal beyond recognition. 

Each filter has controls for varying the high and low corner frequencies of the passband, as well as variable gain and an input attenuator. It can be used as a filter, an oscillator, a noise generator, or even as a resonance oscillator.

Depending on the settings, the filter can be a lowpass, highpass, single-bandpass, or multiple-bandpass.

Adjusting the resonance point can cause the filter to self-oscillate in many ways: By adjusting the controls to just below the point of oscillation, and then applying a pulse, square, or other abrupt-edged input signal waveform will “ring” the filter. A simple “click” on the input can give a percussive output sound – from bass drum to bell to a harsh metallic clang; Crank the controls up and this beast will scream like a banshee!

The oscillation can be damped or continuous. Chain a couple in series and get accumulating feedback – the build-up can be slow, fast or instantaneous.

White Noise is easy to do – you don’t even need an input signal! Turn the input all the way down, and then slowly turn the gain up. You can adjust the “color” of the noise with the frequency controls. Daisy-chaining multiple filters can give a “comb” or multi-phase noise. A single filter can give a STRONG chorus effect if so desired, useful as a sub-oscillator or just to “fatten” a sound.

The barebones kit is $35.