I hope my attempt at embedding a Vimeo link here will work. If it does, it should appear here:
In case it doesn't, I will put the link in clear at the bottom of the post.
Anyway, although the video (hopefully) embedded above is obviously not of the Wattle's engine, it does show a small two-clyinder compound, running at 120 rpm on a head of steam at 120 psi for the ship to do 6 knots. The short film was taken by myself in the engine room of the Clyde Puffer VIC 32 (**LINK**) back in late May this year (actully on my 50th birthday, which was the reason we were doing a five day cruise with the VIC 32 at that specific time).
Although the sound and image quality are not in any way approaching professional quality – it was filmed with my iPhone – one does, I think, get a fairly good impression of how the engine sounds. And yes, just as the Wattle engineer told you, John, it was perfectly possible to stand next to the engine and carry out a conversation in a normal voice! Steam engines are comparatively speaking very quiet … Oh, and the odd noise at around 00:22 is the skipper making a noise down the speaking the tube to alert the engineer that we are 30 minutes away from dropping the anchor for lunch … 
/Mattias
Edited By Banjoman on 01/08/2015 08:04:38
Edited By Banjoman on 01/08/2015 08:04:56
Edited By Banjoman on 01/08/2015 08:05:24