BR> Wouldn't a high value pot on the isolation secondary do?

 If there is any DC the pot will eventually
become noisey. The caps are cheap insurance
and are used routinely - it's good practice.

BR>  RS: >  I don't recommend keeping the speakers
BR>  RS: > connected at the same time. A switch could be

BR> I brought the taps out just in case but no, they're not going to be used.

BR>  RS: >  You could add a potentiometer after the
BR>  RS: > capacitor to vary level. I wouldn't worry about

BR> Is capacitive coupling necessary? Makes sense for an intelligent signal.

 See above.

 TTYL.

 Robert

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