via this auction
"For the first time ever, Throbbing Gristle's legendary effects unit, The Gristleizer, is now available in its classic tabletop form. Though the original design by Roy Gwinn is over 30 years old, The Gristleizer had never seen commercial production until the summer of 2009, when Endangered Audio updated and improved the circuit. The tabletop version is designed to sit within hand's-reach for easy parameter control, e.g. while playing synthesizers. In essense, The Gristleizer is a synth module that works with any audio signal. The audio path is modulated by an LFO using four selectable waveforms (ramp, reverse ramp, triangle, & square), functioning in one of two paths: VCA (voltage controlled amplifier) or VCF (voltage controlled filter). Ranging from light and sweet tremolo to extreme, raunchy ring mod, The Gristleizer is a 100% analog, hand-assembled unit built to last."
See this post on the history of the Grisleizer.
