Dual voltage-controlled slew processor (20HP)
Miasma by Sin Phi.
Sin Phi's Miasma, based on the Befaco Rampage, with a slightly modified FR-4 panel.
There's a few minor issues in the original Sin Phi design. For example, the right EOC is not actually grounded, which is never a problem unless that jack is literally the only connection to another system. Some people also don't like how you need to manually trigger the module to start it looping, but I don't mind. See this page for a revised design with some suggested mods.