On my Dell D620 Win 98 se system, I have not encountered any issues due to the driver. I also played a bunch of music files using the vlc 0.8.4 edition and did not encounter any crashes. I did not try a lot of games but I did hear the starting sounds from the Unreal Tournament before a crash. I generally do not intend to game on the laptop but I think the crashes might have to do with things other than the driver.(My installation is quite minimal and I run the system using a modern SSD. I only applied the RLoew PATCHMEM for the 4gb RAM that is there on the laptop)
Volume Control can be achieved in multiple ways. The volume UP key on my Dell D620 works as does the VLC volume cone slider. The WAVEOUT.EXE can also be used if I am not mistaken.
In my opinion the HDA driver along with the universal VBE graphics driver is the way to go for anyone attempting a Win 98 install on newer hardware configurations.