Trying to get engine sounds working from this file (available from the File Library).

Other sounds seem to work (maybe too loudly), but can't hear engine sounds neither within the locomotive cab nor outside of the locomotive!?

Despite all associated wave files being present and playing OK individually, either the engine sounds are not actually being played or they are extremely quiet!?

Here are the cab and eng sms files (zipped) -

Why can't I hear the engine sounds?