Sound chips for peripherals on layout

For some years now I have been considering adding sound chips (of the type used in greetings cards) for localised sounds on a layout (the layouts have
come and gone, the job never got done). The chips typically hold up to 30 seconds worth of sounds and can be activated by a push button on the control panel or an LDR hidden in the track. On the railway itself, for UK outline, we had slamming carriage doors on cummuter trains, and a guard blowing his whistle, both of which would be nice added to the underside of a passenger platform. For US outline the guard shouting 'all aboard' could be added to a passenger station and the bells at a grade crossing. Off the line the sound of big sheets of metal being hit with big heavy hammers might be coming from an engineering works or the like.
This topic came up on a couple of other groups and some of the links might be of interest to anyone considering the idea . . .
http://www.instructables.com/id/Greeting-Card-Hack / http://www.instructables.com/id/Musical-Greeting-Card / http://www.instructables.com/id/Ghetto-Programming%3a-Getting-started-with-AVR-micro /
http://www.talkingproducts.co.uk/sound_chips.htm
http://www.maplin.co.uk/Module.aspx?moduleno $62 http://www.datasheetcatalog.org/datasheets/270/440306_DS.pdf
Just a thought.
Regards
Mike
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<snip original link list> Couple more came up on uk.rec.models.rail . . .
You could try one of these http://www.quasarelectronics.com/sg01m-four-train-sounds-generator.htm
I got one of these http://www.maplin.co.uk/Module.aspx?ModuleNo1695 a couple of years ago but I did rush it, Christmas eve night !, and it did not work. Got signal to speaker but no sound !
The first is a US outline sound system, very inexpensive, the second is a simple steam sound generator, even cheaper. Not exactly 'finescale' but high pitched steam sounds are fairly easy to generate, either would entertain a kiddie with their first layout.
For my own layout I'm seriously considering the MRC module . . .
http://www.modelrectifier.com/search/product-view.asp?IDw39
A few computer speakers under the baseboard would be fine on a small layout, and in N you would get a better diesel 'rumble' from a bigger speaker.
Regards
Mike
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