> it's not surprising when you are selling an image rather than just a product.
Well, I'd say that you're selling an image and a product. Or a product and an image. Or something.
I was at the local dealer during the Livewire tour, (the Livewire being Harley's all electric bike) and like you I wondered how they were going to make the "classic Harley sound". They didn't try, at least in the current version of the product. But it hasn't been released yet, so there's still time.
Something I've never really understood is the customer compulsion to make it "sound like a Harley". (It *is* a Harley -- it sounds like a Harley *by definition*.) My first two Harleys were used, and the previous owners in each case had replaced the mufflers for something significantly louder. Setting off car alarms as you ride by gets old fast, as does the constant exhaust drone over long distances. On the second bike (a touring model) I talked to the parts guy about it, saying I was looking for a quieter set of mufflers, and he said -- this is a direct quote -- "Oh, you mean the old man mufflers."
Parenthetically, it's more than just the volume, the pitch makes a lot of difference also. The "aftermarket not legal in California" mufflers that came on my used Ultra Classic had a very high pitched blat that was especially obnoxious. The replacements besides being quieter had a bigger resonating chamber and the noise was pitched significantly lower in frequency. If you must have noise, it helps to rumble, not blat.
My current bike is my first new Harley (2014 touring model) and from the first time I rode it, I was shocked at how quiet it was. You just don't think of "harley" and "quiet" in the same sentence. It still had a low pitched rumble when you opened the throttle, but not enough to make you want to wear earplugs on long trips. (I guess I'm getting old...)
So back to the Livewire. I'd be disappointed if Harley saw the necessity to fake the sound of an internal combustion engine digitally. I've seen the Livewire in action (didn't get to ride one only because there was a LONG waiting line) and it makes a low pitched electric-engine growl that still sounds like the bike means business. I suspect that this sound will in time become the new standard.