As far as studio recordings go the use of autotone type devices is NOT cheating. Musicians, producers and engineers are at liberty to use whatever technology at their disposal to further their shared musical vision. Technology (synthesizers, sequencers and MIDI programming) have made it possible to separate the ability to actual play an instrument to make music versus being able to program a computer to make music. Each requires an active musical imagination and each is a perfectly valid method of producing music.
In pop/rock recordings it is typical for a vocal or instrumental solo on the record to have never actually existed as a real performance in the first place. The vocalist might record six different lead vocal tracks. The producer and engineer will then "cut and paste" the best snippets of the six recordings into one composite vocal track. The final "comp" track is a performance that never really took place. If done correctly, the comp track is far superior to any of the individual tracks used to create it. Comping can be done in either the digital or analog domain. Is it cheating? The alternative is to have a performer who can perfectly perform their material. While that sounds attractive, in practice it usually doesn't result in great performances. Knowing that things can be fix later "in the mix" frequently gives musicians the cushion they need to just relax and let the music flow. The stretch out and try a few thinks that they might not if they didn't have their saftey net of studio tricks.
In pop/rock recordings it is typical for a vocal or instrumental solo on the record to have never actually existed as a real performance in the first place. The vocalist might record six different lead vocal tracks. The producer and engineer will then "cut and paste" the best snippets of the six recordings into one composite vocal track. The final "comp" track is a performance that never really took place. If done correctly, the comp track is far superior to any of the individual tracks used to create it. Comping can be done in either the digital or analog domain. Is it cheating? The alternative is to have a performer who can perfectly perform their material. While that sounds attractive, in practice it usually doesn't result in great performances. Knowing that things can be fix later "in the mix" frequently gives musicians the cushion they need to just relax and let the music flow. The stretch out and try a few thinks that they might not if they didn't have their saftey net of studio tricks.