O.K...I don't exactly know why, but after I disconnected the surround unit to take the pictures and reconnected it...it now works! I connected the unit in the same way as before. Line out from the Pioneer integrated (SA-1050) to line in on the surround unit. Speakers connected to the outputs on the rear of the surround unit. I have no idea what changed, but

we have sound. Thanks very much to all who replied and sent their help.