Years ago I saw a doc on Harley Davidson and a part of the design process was ensuring that the bikes made the "correct" HD noise*. What was interesting for a technical perspective was seeing a bike in an anechoic chamber, which had a robot arm waving around an array of microphones so that they could localize sounds emanating from different parts of the bike.
Years ago, when FI was new to motorcycles, I used to work in a bike shop in Raleigh, NC. One of our customers (with a Ducati 916...) was a developer for the company working on the FI computer and software systems for HD. This would be ~1997/98 or so.
He said that the first systems demonstrated to HD were rejected because the tuning had been smoothed out to the point that the classic -potato-potato- idle had been tuned out and it no longer sounded HD-ish enough.
I don't recall if that was a Weber-Marelli or some other system.