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Sound in SheepShaver
Here's what our guide says about getting sound working in SheepShaver:
In “Sound” control panel, select “built-in” for the output device. In Mac OS 9 the Sound control panel is installed with the other control panels and can be accessed in the Apple menu. In Mac OS 8.5/8.6 the Sound control panel is installed in the “Apple Extras” folder. You can use it there to select the built-in output device. If the “Apple Audio Extension” happens to be installed in the Extensions folder, remove it.
This is relevant to SheepShaver for OS X as well as Windows.