The Korg Megatron (Monotron Mod) » Synthtopia:
Wowser, that is a nice looking unit, the Decepticon Logo is the icing on the cake, me wikey! :)
Jacob Watters' modded Korg Monotron Includes: MIDI-IF kit, CV control, Pulse Wave (with PWM, high-pass filter and low-pass filter), Sub Osc 1 (one octave down) with low-pass filter, Sub Osc 2 (2 octaves down) with low-pass filter, AD Envelope, and Overdrive feedback loop.
Here’s a video of the Megatron in action:
More info and schematics at Jacob Watters site.
This is definitely one of the top contenders for the coolest Monotron Mod in my book, what do you think?