not really mono, is it? if it's the left channel of a stereo attempt...mono would be equal levels of all of the source--unless your 2 mics were pointed right at the all of the source, and you lost one channel. if a lot/some of the instruments are muted because you were in ortf, for example, i can't imagine the it's worth the time. if you do have equal levels of instruments in the left channel, you'll get a dead center image. not terrible.