By March 1, 1976, Wozniak completed the basic design of his computer.[22][23] Wozniak originally offered the design to HP while working there, but it was rejected by the company on five occasions.[24] When he demonstrated his computer at the Homebrew Computer Club, his friend and fellow club regular Steve Jobs was immediately interested in its commercial potential.[25] Wozniak intended to share schematics of the machine for free, but Jobs advised him to start a business together and sell bare printed circuit boards for the computer.[26][27][28] Wozniak, at first skeptical, was later convinced by Jobs that even if they were not successful they could at least say to their grandchildren that they had had their own company. To raise the money they needed to build the first batch of the circuit boards, Wozniak sold his HP-65 scientific calculator while Jobs sold his Volkswagen van.[26][27]
to me he just seems like a businessman, not a developer
I volunteered at a university radio station a few times and was taught how to cut out AC/Heater/Fan noise from a recording using audacity on what I think was my second time going in. Recorded a PSA about cancer screening.
It's been almost a decade and a half so I don't remember exactly how, but the point is that it was something they taught people effectively walking in off the street.
I'd imagine it's different with a non-constant fan, but you can force computer fans to a consistent 100% speed through a handful of different ways.
Audacity (or Audition/Cool Edit how the old guys know it) is a bit smarter. It can analyze a recording of the noise floor and then just attenuate that. It's bad for quality music but good enough to improve speech, old tape recordings and records.