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=== Stereo Mono Conversion ===Shorting leads to create a mono signal has been used for the past 50 or so years with headsets. The stereo plug has a tip, ring and sleeve section while a mono headset will have only a tip and sleeve. When the mono headset is plugged into a stereo jack, both ring and sleeve contacts the sleeve section of the mono plug thus combining the two channels into a mono signal.Headsets with a mono/stereo switch also combine the channels by shorting the two hot leads.For more options, you could also combine the channels in a mixer with pan pots. That way you could adjust the amount of stereo spread.