I have my M9 housed in a way that makes it hard to access the output jacks once it's mounted (104.). I want to be able to swap back and forth from a stereo output set up to mono. This would require leaving a short jumper installed in the right output jack. Obviously, this solution will work fine when I'm running to two amps. But if I'm running mono using only the left output, does the presence of that plug in the right jack automatically switch the unit into stereo mode making some fx unusable? You know, fx that that are stereo but whose outputs is summed when using only the left ouput jack. If this is the case is there a work around?