Quick question...My wireless guitar setup is mono....if I want to use a stereo source...can I just use a mono plug out of the source (iphone) and run it into the transmitter? Then will all of the music come out or just one speaker? Or should I do a stereo to mono cable? I can't remember what cables I have used before and I want 'both channels' of audio to be heard even if it's through 1 speaker. Hope that makes sense.