This new micro version of the Pigtronix Disnortion Micro improves on the original’s broad palette of touch-responsive dirt sounds by including the ability to switch from a parallel routing to a new, super-saturated series routing where the 6-stage CMOS overdrive circuit is cascaded into unique Pigtronix diode-clipping fuzz, and then output through a 6-way passive filter network.
A single-gain knob controls the saturation of both the fuzz and overdrive circuits simultaneously. The Parallel routing mode is ideal for players who like to pile on the gain without sacrificing clarity, dynamic response, punch or low end–it’s like double-tracking your guitar inside a micro pedal! The Series routing mode offers an even wider range of gain and more extreme filter effects for metal tones and beyond, including self-oscillating timbres that can be modulated by pickup selection and guitar control settings.”
More info here.