This is the new collaboration between Boss & JHS (Boss' first ever collab). It's 2 different pedals in one, the Boss Blues Driver & the JHS Angry Charlie. You can run either circuit by itself, or in series, with the BD-2 going into the Angry Charlie or visa-versa. You can also run them parallel. Concentric pots are used so each pedal has its own level, tone, and drive. Originally I was looking for 2 overdrive pedals. A lower gain type, like a tube screamer or Klon/klone, and a higher gain "Marshall in a box". The 2 I decided on were the EHX Soul Food and the Carl Martin Plexi Tone. Then I came across the JB-2 Angry Driver. I also picked up a used EHX Holy Grail Plus on eBay, and while I was there decided to grab a behringer TO800 because I wanted to try out a tube screamer without paying high prices. The TO800 uses the 4558 ICs and MA 150 diodes, but it's only $20 new because its comes in a plastic case and uses crap knobs/switches. But the A/B comparisons on YouTube sounded spot on to the TS808.