If you cheat a bit.
My little Prince - called Val on my burgeoning Bhynsell layout - has ample oom for a decoder so I fitted a standard sized Gaugemaster one. This works fine. However, I wanted to add sound so thisis how I did it.
I have now got hold of a Digitrax SDH164D sound decoder which has been loaded with a custom sound file (the standard steam sound is for a US switcher). The one loaded up is
Loco Model BR#5526 "Light Prarie Tank" 2-6-2 engine Scheme
I know that this isn't correct but it is the closest I could get. A 2-6-2 has larger wheels so there aren't enough chuffs but the loco has side skirts so it doesn't notice too much. I have set up the sound decoder and the loco as a consist. This is purely for test purposes at the moment but if it works out I will be putting the sound decoder and the speaker in a box up in the light arch so we should get a non-directional sound. Given my little Prince, this is probably as good as it gets!
Let me know what you think. Please remember that I have had this sound chip about 10 minutes so I have yet to get fully to grips with it.
This little video gives you a taster.
http://youtu.be/W_Qg8179x3I (http://youtu.be/W_Qg8179x3I)
Looks very good! I like it!
Have you got any room in the tender? Maybe you could put the speaker there so it moves around the layout?