Thanks to those who responded to attempt #1.
(I've had problems getting back onto the site since first registering, and no-one answered my requests for assistance. Hence I've re-registered as U/S 2.)
I took on board the comments made previously, and my second attempt at using GPO (same piece) is here:
N.B. The piece is Weirdstone 1, though feel free to have a listen to Weirdstone 2 this version of which is for piano solo.
I am aware that there are a couple of occasions where an entry seems to come a shade early - that's me trying to counter the very slow attack on the strings, perhaps unsuccessfully at times.
Is the ambience any better?
Re: Second attempt
Really nice work on this, U/S2!
Love the writing; and the realism is coming along much, much better!
I see/hear what you mean about your difficulty with the strings... but don't have an answer for you -- hopefully someone more technically astute than I am in this area will come along to give you a hand!