That's a really cool project. On one hand, I feel like it's wasteful to do stuff like this digitally, with FFTs, rather than with analog filters. That's a whol

That's a really cool project. On one hand, I feel like it's wasteful to do stuff like this digitally, with FFTs, rather than with analog filters. That's a whole lot of transistors to do something that could be done with vastly fewer with an analog approach. On the other hand, the digital approach is more flexible, almost certainly lower power, and not much more expensive. The rise of tiny chips that are great at DSP, partially driven by mobile tech, is really exciting. It'll be great to see what it's going to lead to in future.