The 4-cam engine, for all the hype over the years, sounded just like all of our type 1 engines below 4,500 rpm and was available as a factory (and often as a dealer) option for those who wished to drive the price of their tiny, little German sports cars up higher than the cost of a similar year Corvette. Of course, putting that engine in, say, a 550 Spyder to annihilate said Vette happened more than once, for sure.
BUT! Get that same 4-cam up over 5 grand and into the 7K - 8K rpm range and that Banshee wail was both mesmerizing and terrorizing, especially when it went quickly past said Vette driver.
Few of us ever get to hear a 4-cam at speed on a track, these days. The last I heard one was at Lime rock Park a few years back on one of their "Historics" race days. They have a glorious, upper register sound, to be sure.