a. David Werblo reminded me that a maximum volume bug with After Dark Online had been mentioned previously on MacFixIt.
b. Several readers pointed out that sometimes changes in the Control Strip modules are not retained. You need to make changes in the actual control panel.
c. Erik Dubovik claimed that deleting the Sound Manager file he found in his Extensions folder (which supposedly is not needed in Mac OS 7.6.1) cured his maximum volume problem.
d. Nor surprisingly, several readers suggested zapping the PRAM as a cure.