Lemmings Revolution isn't properly selecting the default sound device
(Having done direct sound programming, this is not surprising).
I disabled all the sound devices I didn't want to use (Bluetooth
audio, and Virtual Audio Cable, neither of which were being used but
always exist) and everything worked.
I tried to figure out how it selects the device, but I didn't get very
far. I know when I had a Bluetooth headset connected and my default
sound device was Sigmatel audio, I got the movie sounds through the
Sigmatel, and the games sounds through the Bluetooth. If I changed
the default to bluetooth, I no longer got games sounds.