Thanks everyone for your excellent advice. Tweaking the backup vocals turned out to be much less daunting than i had anticipated, especially with y'alls encouragement. At times I thought I was thinning out the singers so severely that they would waste away to nothing, but it turned out the opposite. With a little experimentation I found the frequencies that gave each voice its character and cut back on everything else. This let the instruments get to an audible level without straining.

Perhaps I should have told you that would be doing every thing in BiaB and RealBand. I used the EQ, reverb and comp that come with RealBand. The EQ did not even have notches for the freqs you mentioned, but it worked out anyway.

The last thing I did was give every backing vocal the same reverb, to make then sound like they were in the "same room." Thanks especially for that tip.

Anyway, here is the result:

https://www.youtube.com/user/flatfoot50#p/u/0/nH7amRKeoks


Flatfoot sez: Call me when 'Talent-in-a-Box' is ready to ship! -- [8{>

Got some tunes on You Tube:
http://www.youtube.com/user/flatfoot50
.
My BiaB lesson site:
http://jdwolfe0.wixsite.com/learnbiab