What does it matter which skill is more impressive? Obviously there are way fewer successful indie developers than top tier developers, and obviously life as a successful indie is way better. Yet, there is such a thing as writing high quality code, which is more or less orthogonal to being a successful indie. And that was what we are discussing.

It's a bit like being a fast runner and being a good football player. There's some connection, but it's not like the fastest runners are the best players, or the other way around. Different skills.

As to low level audio, I know what you're referring to, and it doesn't say that much really. My co-founder at my previous startup wrote a bunch of DSP code that worked, and was probably more complex than the pause removal, but he was still a pretty random developer. His code was sometimes surprisingly bad. Marco's strength is to not shy away from anything, even if it sounds scary or complex. DSP sounds complex, but it's not string theory.