I think that's a little bit pedantic. Complaining loudly about how the knocks technically aren't, themselves, longer or shorter is a digression from the reality

I think that's a little bit pedantic. Complaining loudly about how the knocks technically aren't, themselves, longer or shorter is a digression from the reality that any sane human can detect and recognize consistent patterns in a series of knocks on a door, or beats on a drum. shave and-a hair cut... two! bits! [0] match in-the gas tank... boom! boom! [1] –··–· ·· Everybody recognizes that knock pattern, whether they know the trivia behind its origins or not. The singular instrument leaves the interpretation to the pattern of the beats alone. Meanwhile, a rimshot, involving two drum hits and a cymbal crash offers two channels of interpretation. ba-dum tiss! [2] The rhythm and the sound could each carry separate messages, which means the carrier signal would have to be agreed upon, before sending the message. Is the cymbal crash the best carrier for the dashes, or is the rest note in between the drum hits and the cymbal crash actually the pause that signals the dash? [0] https://en.wikipedia.org/wiki/Shave_and_a_Haircut https://en.wikipedia.org/wiki/Shave_and_a_Haircut [1] https://www.youtube.com/watch?v=i5KBVCoKYt0 https://www.youtube.com/watch?v=i5KBVCoKYt0 [2] https://en.wikipedia.org/wiki/Rimshot https://en.wikipedia.org/wiki/Rimshot