Guys- Attract mode sounds appeared first in Banzai Run when Lane Change low voltage switches were moved from the flipper EOS position to the flipper buttons.
Whirlwind has no Lane Change feature, so no switches, no sounds - as easy as that.

Oh- just realised you weren't talking about the sounds on the flipper buttons.

But there -- System 11 Banzai Run and Space Station had them while later pins do not have them any more, at least not by default. Don't think System 11 did not have the ROM space for that - rather that operators or bar owners asked for them being turned off around 1990.

--Enver