Just got a Boss ME-50B. Wow! I love it. But I can't get any effect using the Chorus. Is this because it is a stereo chorus and will not work at all if I have a cord coming out of only the left (mono) output? That makes sense, but I figured it would still produce the effect, just not in stereo. If I'm right (and I never am, ask my wife), is there such a thing as a stereo to mono 1/4" jack -- two jacks that merge into one? Any help would be greatly appreciated.