Built around the TPA3118, Higher Power is a 60W class d solid state power amp solution. 

Don't be fooled, it'll push your 4x12 plenty but it shines on a 1x12 or 2x12 at bedroom levels. The buffer inside sets up your signal with a nice flat response going into the power section so you can drop your favorite preamp pedals in front.

This Heavy Earth

Official Product Video

Demo by Truck Driver Shawn

Product Page

Higher Power

At it's core was the Ampeg VH140c but don't be fooled, I couldn't help myself but to make a few [more] tweaks to better fit my taste. I have sat on this version for over a year when I started my amp and it’s what FleshRot should have always been. I found the circuit to be a bit darker than I prefer so first up was adjustments to the filtering. While I was in there tuning it, I have adjusted the tapers on the knobs as well to allow for more ease in dialing in your tone. I found the original amp to be a bit touchy on some the controls.

Review by sevenstring.org

Demo by That Sounds Terrible

Demo by Metalhead Productions

Review by The Gear Page

Flesh Rot v2

This design started as a Rat style distortion but with the goal of more gain, loads more output, thick to tight low end, and of course it needed a clean blend for those of us who prefer that for gain stacking and the bassist out there. Drop the gain to zero, turn up the tight control, and use it as a boost or do just the opposite for massive doom.

Demo by J Cruz Project

Bad Trip

What started out seeking the warm overdrive of the 808 but precision tone shaping of the ST9 to create anything from tight modern metal to fat blues grit resulted in the GRIM overdrive. Mix the versatile range of tone shaping controls with additional headroom from the internal charge pump and it's off to riff city.

Review by Rig-Talk

Demo by Angry Tones Riff Clips

Demo by CoolGuitarGear

Grim3

Based on the Peavey amp, this preamp pedal is built to achieve that super saturated death metal guitar tone. Famously stacked with chainsaw tones to get that Slaughter of the Soul guitar tone. This is the high gain channel as a standalone preamp with some modifications. My modifications maintain the original character but are what consider "quality of life" upgrades as they just make it slightly easier to dial in.

The active 3 band EQ makes it easy to dial in some killer tones but for some additional flexibility look inside to find DIP switches for the Bright (originally only available on the clean channel), hi/lo Gain, and Mid Shift controls just like the original. 
Running at ±15v inside means you'll have the same headroom you'd expect from the original design.