Gary and Drake
Thank you both very much for your comments. Gary you have more in mind the same thing as I did. This is what I had mentioned to the Yamaha man who called me.
I had planned on using a Radio Shack, 4 Channel Stereo Sound Mixer. This has a switch for Stereo or Mono.
Yamaha thought if I kept it on Mono it just might work.
Being laid up for the passed several years, and wishing not to long in the future, I am still hoping to give it a try. In the meantime I thought someone else just might be interested in this idea.
I believe I am the oldest person on this site but not to old to still get some ideas.
Best wishes to you both and all members of Joe's wonderful site and his administrators. I always had great help when needed.
Larry