It's definitely a straightforward and cost-effective circuit to build. The real cost (and test) is in the DSP programming. There's a reason a Fractal Axe-FX or

It's definitely a straightforward and cost-effective circuit to build. The real cost (and test) is in the DSP programming. There's a reason a Fractal Axe-FX or Kemper Profiler is so expensive, and it's not the bill of materials. Electro-Harmonix sells a lot of DSP based pedals like the POGs and the B9/C9/M9 series, but I'd bet it's a small fraction of the number of Big Muffs they move, which they don't seem to be in any hurry to digitize. It's a lot easier to capture the sound of a '70s Big Muff by just building a Big Muff circuit than by programming a simulation of one. Lest you think I'm some kind of analog purist, I'm actually currently building a batch of pedals for sale that use an AVR MCU an its internal ADC to generate 3 different octaves of square wave output.