Well, that was a lengthy, convoluted journey in order to get back to where I already was.
After an hour's faffing about trying to get rid of the patches of distortion that were irritating me, I concluded that it was actually in part these that gave it that 'big band' quality that Rosie discerned in her earlier kind comment. So I've put it back on ACIDPlanet in its original form.
Funny about the 'big band' sound. Most of the time all you're hearing is one guitar, bass and drums. And there's no brass apart from some horns in the intro, and the 'trombone' solo on the Yamaha synth. Your ears can deceive you.