Upon rebooting, following a faultless install of Windows 98, I got "The AudioPCI interrupt has been routed incorrectly by the system. Sound inactive. Use Automatic Settings in the Device Manager". The soundcard is a Creative Labs PCI 128 which I've been using with Windows 95 for more than a year. And of course "Automatic Settings" was already set in Device Manager, but manual configuration is disallowed anyway.
Re-installing the both the card and the drivers have made no difference.