Well I don't want to celebrate just yet but...
My DS who has been relatively difficult to settle just lately went off like a dream to a few White noise tracks I've been playing on repeat!
The norm is that it'll take a few attempts to settle him and mainly by nursing him down to sleep,although I've been trying to stop that and get him to SS.
The 2nd time I put him in the cot he began to fuss and I turned on (and up quite loud) the White noise and after an acknowledgement of the noise he self settled, not heard a pip since!!!
He usually wakes a couple of times (approx an hour or so after settling) and around this time now for a feed so watch this space to see whether it is indeed a useful tool!
I'm quite excited... (and admittedly a bit tipsy)