I think the audio is random no matter what button you hit, but the audio tracks themselves are very similar.
To test it out, close or cover your eyes and keep hitting the same button.
Is it the same audio either way?
it sounds like the "a" stands out more in bacon cause it's higher, and the "ee" in beer can cause it's slightly longer...
Am I the only one right now where a regular google search for "bacon" brings up potentially NSFW images on the main page?