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Most of us are currently living off relatives, friends, parttime-jobs or savings, to be able to work as much and cheaply as possible.
Ability to increase/decrease tempo/octave/pitch. You can do stuff like this easy enough with open source algorithms available online but it won't sound very good.I'm working on a similar project except it includes hardware interfacing as well (also probably a smaller scope than your project). I'm really not worried about sound quality though, as long as it roughly does what it's intended to do. STFT frequency shifting using a phase vocoder + Laroche/Dolson phase propagation to change the pitch of the signal and then throw in some auto correlation beforehand for detection and threshold setting.