Look up pedal schematics at some of the do it yourself effects pedal websites. Most of the boutique pedals are based on classic original overdrive and distortion pedals, typically with a few adjustments to the EQ and maybe a few extra switches for additional adjustment. Wampler makes nice stuff along with many other makers, but IMO you can also get equally good sounding stuff at a much more affordable price point from large scale makers like Boss, MXR, Electroharmonix, and TrueTone. It's mostly economies of scale- the large scale makers have a lower cost per unit and so it's cheaper for you. The boutique makers just don't sell a high enough volume to be able to make a profit at a lower price. The Wampler is essentially an overdrive and a distortion. Similar concept to the TrueTone Jekyll/Hyde. I did a little poking around and believe the OD side is fundamentally based on a Tubescreamer circuit, but it probably has been adjusted a lot. Not sure what the distortion side is based on. You could probably buy something like a Boss SD1 and a RAT or Son of Hyde pedal and with the two of them together have a similar range of gain and EQ adjustment on tap. Go look at freestompboxes.org and from perusing the site you will realize that most boutique pedal offerings are just as I have described-- mods to classic, basic effects pedals.