Quartz
Guitar preamplifier pedal, clarity and flexibility in a box.
Designed for those of us without 3-band "Fender-style" amplifier equalization, Quartz lets you tone shape to your hearts content. Also does a decent job of making your humbucker Les Paul sound just like a strat. Mid scoop to the end of the world and back.
Audio Samples
I wanted the A/B comparison to be an exact compare for this one, so I used one DI'ed track and reamped it through twice - one with Quartz, and one without Quartz.
Here's the full signal chain: Guitar - DI - Reamp - Pedals - Peavey Classic 30 - Suhr Load & Cab Sim - 1073 - 1176