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Not a lot of experience here for this sort of issue then :-(
Ok, an update. Been playing around with the W7 sound controls. Particularly the pop-up showing the hardware settings (but also in the slider controls shown for different things).
I don't note every step I make so when I reach a situation Lord only knows how I got there or what was significant.
Changed speakers to default, switched off any extra stuff, not that I recall much. As for the sliders shown, set any I found to max and now jump out of my skin when the regular PC use chings or beeps.
I reached a point where the game was finally not making any sound at all ! Well ok at the start when it presents the menu the music was plain enough, but there must be different streams of audio treated separately for some reason as, as soon as one pressed play, the sounds went.
At this point it's fair to say I find the W7 controls confusing. Time was (XP and before) when each slider seemed understandable, now we seem to get one for every application that's open and could make sound.
Anyway I had a brainwave (or is that brainstorm ?) which has at least brought back sound to the speakers. (I've not yet experimented to see if it has cured anything else.)
Started the game. Control Tabbed out to the rest of the PC. Spotted the sliders had added a further one for the game (which of course is normally not seen as one is in a full screen game). It was already unmuted and set to max so no issues there then. Moved the slider up and down, no change. Muted the thing, no change. Unmuted it, music !
There is obviously something wrong with the game/windows communication. W7 shows a sound stream as unmuted but it is muted. It is lying. One mutes it and unmutes it again and sound is suddenly heard.
Anyone know of this defect in W7 ? Is there an easy way to "patch" it ?