Twin sports - permanent V8 rumble (ala TVR) quite loud to very loud all the time.
I personally never found the Librands "quite loud to very loud all the time", but only really noticed them becoming loud when you hit the
GO! pedal!

I'm not a lover of exhausts that drone and therefore, had the sport exhaust been too loud or intrusive, I wouldn't have enjoyed it.
I'll also add that I found the sound quite melodious, somehow richer and with more V8-variety than the sound that comes from other options.
Steve, this is a question which often gets asked; therefore, I will try to get some video clips on the 19th, when we do the Rolling Road day (some static and some with ‘drive-by’).