Ritual Electronics released Miasma

Miasma is a voltage controlled distortion with a feedback loop you can push to self oscillation for insane results, and interchangeable rectification diodes, giving you an unlimited amount of sound possibilities within one module.

Miasma feedback path feeds the distorted signal back in the input with no phase inversion, causing the module to self oscillate, even with no input. The feedback path can be opened to send it through different effects making Miasma perfect for complex feedback patches.
A blend knob allows Miasma to be used in a precise way, for more complex sound design.
The module’s clipping diodes are mounted on a header making it easy to swap them and craft the sound you want. The module ships with six different diodes, from germanium to LEDs and you can experiment adding your own. The output level may vary depending on which diodes you use, this can be adjusted with the level trimmer on the front panel.
We have developed Crime, a 4HP expander for Miasma which can switch between 12 different diodes without the need of taking the module out of your case.

More info here: Ritual Electronics | Miasma