Universal Audio UAFX Knuckles

Wow this thing sounds so good! I am using it with a HSS Strat and several pedals and it works flawlessly.
Contrary to what one may think this thing does not only do metal, both the orange and the red channel (in vintage mode) can give you amazing crunch / distorted sounds.
With the app you can customize the power section which have a huge impact not only on the sound but on the feel as well. The tube rectifier gives such an interesting spongy feeling.

It takes pedals very well, in fact I am surprised how well my fuzz works with this pedal not only to spice up some clean / pushed tones but also to tighten up high gain tones.

It would take 5 stars if not for 2 flaws which I hope can be addressed via updates later on:

- While you can store many presets you can only assign 1 preset to the footswitch! Otherwise you are cycling to live mode which basically uses the settings on the pedals. This is annoying, I think switching 2 channels at least is a must!

- Sometime the app (which you need to recall your presets and tweak things like the power section: rectifier mode, tube type, etc) will fail to connect and you have to power cycle the pedal. This is super annoying and I hope it gets fixed soon.