The amazing thing is that one guy is behind everything you see and hear. Dr Pigeon is like a polymath. He develops and runs the site, creates all the sounds and plays all the instruments (with a few exceptions). I beg everyone who uses that site to donate, so he can keep going.

For multi-track recording, you’ll want a DAW. The best free DAWs, IMO, are Reaper and Cakewalk. Personally, I prefer Cakewalk for several reasons but mainly because I don’t like Reaper’s UI. Although, Reaper has a portable version which is super nice.

I still advice you to run the final mix through Audacity, though, since I find its processors superior for mastering than Reaper’s or Cakewalk’s built-in ones.