Their popular B3K V2 keeps the same grind as the original design and adds the ability to restore the mid frequencies. Now you can send your bass rig into meltdown without losing any clarity. If you're looking to add grind to your tone while maintaining your tonal core, you can't go wrong with the Darkglass B3K V2.

Product Page

Review by no treble 

Manual

Demo by patric hunter 

Demo by the bass channel 

Microtubes B3K v2

The Microtubes X Ultra greatly expands on the already immense versatility of the Microtubes X7. Featuring all the great controls that its predecessor has that allows users to select exactly what frequencies they want to compress and saturate for the low and treble respectively, but with four major additions providing an additional layer of flexibility, while maintaining the same compact footprint, making it an extremely complete tool for the modern bassist.

Demo by The Bass Channel

Official Product Video

Review by Mike Brooks, guitarworld.com

Review by Rainer Wind, bonedo.de

Microtubes X Ultra

Super Symmetry (Black)

The Duality is a unique fuzz pedal that contains two discrete fuzz circuits—a gated saw-tooth wave and a raunchy high-gain sound—which can be mixed together to yield a vast selection of distinct sonic textures

Demo by Patrick Hunter

Product Page 

Review by Mike Brooks, musicradar.com

Darkglass Duality Product Video 

Duality Fuzz

Amplifier Footswitch for Darkglass Microtubes 900 and 500 Watt Heads

Demo by  Patrick Hunter

Review by reddit /Darkglass