On a default Windows 98 install you will find you have no sound:
The first thing to do is to shut the virtual machine down. Open up the folder where the virtual machine is stored. Right click the Virtual Machine and click "Show package contents"
Within this folder will be a file called
<machine name>.vmx - right click this file and edit it with a text editor. I used BBEdit in this example.
Add the following line to the vmx file:
sound.virtualDev = "es1371"
Now start the virtual machine (cancel any install hardware prompts) and install the Creative ENSONIQ Audio software from the creative website or here from archive.org.
Reboot and you will have sound!