Heh - there is no sound when the Master Caution light comes on - thats the funny bit - even on brand new planes just the MC light might come on without any annunciator light illuminating - forcing you to push both annunciators to get the light work... Its not the best system in the world - and rather crude for a plane that has only been built for ten years... (Well, from 90% recycled designs that might have been unchanged since 40 years
)
Couldnt find a TCAS sound bite anywhere quickly - (possibly because there is no easily accessible vocab test) but here is a GPWS test:
http://www.b737.org.uk/gpws.wav
If you have any more questions about the NG, fire away
Best regards...